Document:

SUPPLEMENTAL INDENTURE
                            ----------------------

            SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of
March 31, 2000 among Muzak Houston, Inc., a Texas corporation (f/k/a Taft
Broadcasting Company) (the "New Guarantor"), a subsidiary of Muzak LLC (or its
successor), a Delaware limited liability company (the "Company"), Muzak Finance
Corp., a Delaware corporation ("Finance Corp.", and together with the Company,
the "Issuers"), the Guarantors (the "Existing Guarantors") under the Indenture
referred to below, and State Street Bank and Trust Company, as trustee under the
Indenture referred to below (the "Trustee").

                             W I T N E S S E T H :
                             -------------------

            WHEREAS the Issuers have heretofore executed and delivered to the
Trustee an Indenture (as such may be amended from time to time, the
"Indenture"), dated as of February 2, 2000, providing for the issuance of up to
an aggregate principal amount of $50,000,000 of Senior Subordinated Floating
Rate Notes due 2009 (the "Notes");

            WHEREAS Section 4.22 of the Indenture provides that under certain
circumstances the Issuers are required to cause the New Guarantor to execute and
deliver to the Trustee a supplemental indenture pursuant to which the New
Guarantor shall unconditionally guarantee all of the Issuers, obligations under
the Notes pursuant to a Guarantee on the terms and conditions set forth herein;
and

            WHEREAS pursuant to Section 8.01 of the Indenture, the Trustee, the
Issuers and Existing Guarantors are authorized to execute and deliver this
Supplemental Indenture;

            NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the New
Guarantor, the Issuers, the Existing Guarantors and the Trustee mutually
covenant and agree for the equal and ratable benefit of the Noteholders as
follows:

            1. Definitions. (a) Capitalized terms used herein without definition
shall have the meanings assigned to them in the Indenture.

            (b) For all purposes of this Supplemental Indenture, except as
otherwise herein expressly provided or unless the context otherwise requires:
(I) the terms and expressions used herein shall have the same meanings as
corresponding terms and expressions used in the Indenture; and (ii) the words
"herein", "hereof" and "hereby" and other words of similar import used in this
Supplemental Indenture refer to this Supplemental Indenture as a whole and not
to any particular section hereof.
<PAGE>
            2. Agreement to Guarantee. The New Guarantor hereby agrees, jointly
and severally with all other Guarantors, to guarantee the Issuers' obligations
under the Indenture and the Notes on the terms and subject to the conditions set
forth in Article 10 of the Indenture, and to be bound by all of said Article 10,
as a "Guarantor" thereunder, and to be bound by all other applicable provisions
of the Indenture. From and after the date hereof, the New Guarantor shall be a
Guarantor for all purposes under the Indenture and the Notes.

            3. Ratification of Indenture; Supplemental Indentures; Part of
Indenture. Except as expressly amended hereby, the Indenture is in all respects
ratified and confirmed and all the terms, conditions and provisions thereof
shall remain in full force and effect. This Supplemental Indenture shall form a
part of the Indenture for all purposes, and every Noteholder heretofore or
hereafter authenticated and delivered shall be bound hereby.

            4. Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY,
AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK BUT WITHOUT
GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW.

            5. Trustee Makes No Representation. The Trustee makes no
representation as to the validity or sufficiency of this Supplemental Indenture.

            6. Counterparts. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement.

            7. Effect of Headings. The Section headings herein are for
convenience only and shall not affect the construction thereof.

                                       2
<PAGE>
            IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the date first above written.

                                           MUZAK HOUSTON, INC.

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           MUZAK LLC

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           MUZAK FINANCE CORP.

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           EXISTING GUARANTORS:

                                           MUZAK HOLDINGS LLC

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           MUZAK CAPITAL CORPORATION

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           MLP ENVIRONMENTAL MUSIC, LLC

                                       3
<PAGE>
                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           BUSINESS SOUND INC.

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           BACKGROUND MUSIC
                                           BROADCASTERS, INC.

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           AUDIO ENVIRONMENTS, INC.

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           TELEPHONE AUDIO
                                           PRODUCTIONS, INC.

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           MUSIC INCORPORATED

                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           VORTEX SOUND COMMUNICATIONS
                                           COMPANY, INC.

                                       4
<PAGE>
                                           By: /s/ William Boyd
                                              ________________________________
                                              Name:  William Boyd
                                              Title: Chief Executive Officer

                                           STATE STREET BANK AND TRUST
                                           COMPANY, as Trustee

                                           By: /s/ Jacqueline A. Bonhomme
                                              ________________________________
                                              Name: Jacqueline A. Bonhomme
                                              Title: Assistant Vice President

                                       5A portion of this document is confidential and has been omitted and filed
separately with the Securities and Exchange Commission in connection with a
request for confidential treatment of such omitted material.

                              CAN SUPPLY AGREEMENT
                              --------------------

 This Agreement is made this 22nd day of February 2000 between AMERICAN NATIONAL
 CAN COMPANY, a Delaware corporation, with its principal offices at 8770 W.
 Bryn Mawr Avenue, Chicago, Illinois 60631 ("ANC"), and COCA COLA BOTTLING
 COMPANY CONSOLIDATED, with its principal offices at 1900 Rexford Road,
 Charlotte NC 28211-3481 ("Buyer"), and covers the manufacture and supply by ANC
 to Buyer and the purchase by Buyer of two-piece aluminum beverage can bodies
 and ends (herein sometimes collectively referred to as "cans" or "containers")
 of the specifications and quantities referred to hereinbelow.

         WHEREAS, the parties entered into a Can Supply Agreement (the "1995
Agreement") dated October, 1995 with an initial term of 5 years expiring on
December 31, 2000; and

         WHEREAS, the parties are desirous of entering into a new long-term
supply agreement covering certain of Buyer's requirements of Containers, which
will supersede the 1995 Agreement;

         NOW, THEREFORE, in consideration of the mutual covenants set forth
herein and for other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the parties hereby agree as
follows:

         1. Description of Products. This Agreement relates to containers of the
specifications set forth on Exhibit A attached hereto, required by Buyer at its
can filling location(s) set forth on Exhibit B (and at any additional or
substitute facilities where Buyer may fill cans if this contract covers all of
Buyer's can requirements).

         2. Term. The initial term of this Agreement shall be four (4) years
commencing January 1, 2000 and terminating December 31, 2003.

         3. Volume.

         (a) Buyer agrees to buy and ANC agrees to sell, in each calendar year
during the term of this Agreement a minimum of 100% of Buyer's requirements at
its filling facilities identified on Exhibit B. Can bodies and ends shall be
purchased by Buyer and supplied by ANC in substantially equal volumes.

         (b) The foregoing annual volume of containers to be purchased hereunder
may not be changed by Buyer during the term of this Agreement without the
written consent of ANC although ANC will use its commercially reasonable best
efforts to accommodate year over year changes hereafter requested by Buyer in
its annual volume.

<PAGE>

         4. Pricing.

         (a) Prices under this Agreement shall be established and adjusted in
accordance with the terms, conditions and limitations set forth on Exhibit C
attached hereto. In addition to the price adjustment mechanisms set forth on
Exhibit C, any changes in the specifications of containers supplied hereunder
may result in an upward or downward price adjustment.

         (b) ANC will in no event be required to meet competitive metal purchase
formulas or other competitive offers driven by lower metal costs; however, and
notwithstanding the foregoing, ANC intends to be competitive with specific
offers not driven by lower metal costs.

         (c) It is agreed that, on and after January 1, 2001, ANC will be the
sole purchaser of metal for the cans to be supplied hereunder for the remaining
term of this Agreement.

         5. Payment Terms. Payment terms shall be: 1% 10, net 30 days. Interest
shall be assessed on all past-due amounts at the annual rate of two (2%) percent
above the prime rate of interest at the First National Bank of Chicago, Chicago,
Illinois.

         6. Delivery. Buyer shall advise ANC, prior to October 31, of its annual
requirements of containers under this Agreement for the upcoming calendar year
(the "Forecasted Volume"). ANC shall not be required under any circumstances to
sell containers, priced on a ceiling/no floor basis, to Buyer in excess of such
Forecasted volume. If the Forecasted Volume is in excess of or less than the
volume referred to in subparagraph 3(a) above, ANC shall only be required to use
its commercially reasonable best efforts to provide such excess to Buyer or
accommodate such shortfall. In the event that the Forecasted Volume is in excess
of the volume referenced in subparagraph 3(a), ANC; shall first attempt to
secure metal under a ceiling/no floor pricing mechanism. If ANC is unsuccessful
in securing ceiling/no floor pricing for such excess, then pricing for the
excess volume will be based on the Midwest Ingot Price on the date ANC purchases
metal to satisfy Buyer's excess requirements.

         7. Effect of Termination. Upon termination of this Agreement, for any
reason, Buyer shall accept all completed, specially fabricated or lithographed
containers and related items previously ordered, acquired or committed for by
ANC in reasonable quantities in anticipation of Buyer's normal can requirements.

         8. Warranties, Claims and Limitation of Liability.

         (a) ANC hereby warrants to Buyer that the containers to be manufactured
and sold to Buyer hereunder shall be free from defects in workmanship and
materials, and shall conform to the specifications set forth in Exhibit A
attached hereto. EXCEPT AS EXPRESSLY STATED ABOVE, THERE ARE NO OTHER WARRANTIES
OF ANY KIND, EXPRESS OR IMPLIED INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

                                       2
<PAGE>

         (b) ANC shall not be liable to Buyer or to any other person where the
claimed damages result from: (1) Buyer's faulty assembly or closure of the can
body and loose end; (2) rust or outside corrosion on containers occurring after
Buyer's receipt, except when caused by ANC's faulty workmanship or imperfect
materials; (3) the failure of Buyer (or any other party from time to time having
custody or control of allegedly defective goods) to exercise reasonable care in
conveying, warehousing, using, packing, handling, distributing or storing filled
or unfilled containers; or (4) the failure of empty or filled containers
exported or used in foreign countries unless a special warranty has been
specifically approved by ANC to cover such exported containers.

         (c) Seller shall give immediate consideration to settlement of Buyer's
claims, but in no event shall Seller be liable on any claim unless notice
thereof is received by ANC by the earliest of: (i) 30 days after discovery of an
alleged defect; (ii) 60 days after the alleged defect reasonably should have
been discovered; and (iii) 365 days after Buyer's filling of allegedly defective
containers. Failure to assert a claim within such period shall constitute a
waiver of the claim, and shall discharge Seller from any responsibility.

         (d) ANC's liability to Buyer hereunder shall be limited to Buyer's cost
of the defective containers, cost of the contents of the containers lost as a
direct result of the defect, and the reasonable cost of recovery and disposition
of defective containers (but as to the latter, only to the extent reasonably
required). ANC shall also be responsible for the defense of claims by third
parties to the extent arising out of a container defect provided that ANC is
given adequate advance notice of such claim and the opportunity to defend such
claim by counsel of its own choosing.

         9. Metal Savings. Savings realized by ANC on reductions in the amount
of metal used in cans or ends shall be shared with Buyer on a 50/50 basis once
ANC has fully recovered its implementation costs.

         10. Force Majeure. Except for the payment of money due to ANC by Buyer
for cans previously shipped to Buyer, ANC and Buyer shall be excused for failure
to perform under this Agreement where such failure results from circumstances
beyond the affected party's reasonable control including, without limitation,
such circumstances as fire, storm, flood, earthquake, strikes, work stoppages or
slowdowns, delay or failure of transportation or suppliers, acts of the public
enemy, acts of God or acts, regulations, priorities or actions of the United
States, a state or any local government or agents or instrumentalities thereof.

         11. Notices. All notices, requests or other communications shall be in
writing, and shall be deemed given when delivered personally or deposited in the
United States mail, postage prepaid, or to a courier service and properly
addressed to Buyer at: 1900 Rexford Road, Charlotte, NC 28211-3481 and to ANC
at: 8770 W Bryn Mawr Ave., Chicago, IL 60631, ATTN: Sales Department, or to such
other address as either party may, from time to time, designate to the other in
writing.

         12. Assignability. A party to this Agreement shall not assign or
transfer its rights, duties or obligations hereunder to a non-affiliate unless
the other party hereto

                                       3
<PAGE>
consents to such assignment in writing prior to any such assignment, which
consent shall not be unreasonably withheld. A "non-affiliate" shall refer to a
third party that does not directly or indirectly control or is not directly or
indirectly controlled by, or under common control with, a party to this
Agreement, where control means possession, directly or indirectly, of 50% or
more of the voting interests of the entity in question. Further, in the event
that there is a Change of Control (as defined below) of a party to this
Agreement, the other party shall have the right to terminate this Agreement
immediately upon written notice to such party, effective upon delivery of such
notice. For purposes of this agreement, "Change of Control" of a party means (i)
the acquisition by any person, entity or "group" [as defined in Section 13(d)(3)
of the Securities Exchange Act of 1934, as amended (the "Exchange Act")] of
beneficial ownership (determined in accordance with Rule 13d-3 under the
Exchange Act) of greater than 50% of the combined voting power of the party's
then outstanding voting securities or interests or (ii) the approval and
consummation of (A) a reorganization, merger, consolidation or sale of all or
substantially all of the assets of the party, in each case, with or to an entity
of which persons or entities who were the owners of the party immediately prior
to such reorganization, merger, consolidation or sale do not immediately
thereafter, beneficially own (determined in accordance with Rule 13d-3 under the
Exchange Act) more than a majority of the combined voting power of the
outstanding voting securities or interest of the reorganized, merged,
consolidated or purchasing person or entity or (B) the dissolution and
commencement of the winding-up of the party. Buyer hereby agrees to require the
purchaser, transferee, or successor to a Change of Control of all or any portion
of its can filling operations, as a condition of the transfer, purchase or other
transaction, to assume that portion of this requirements contract that relates
to the portion of its operations being sold, transferred or otherwise affected.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date and year first above written.

AMERICAN NATIONAL                            COCA-COLA BOTTLING
CAN COMPANY                                  COMPANY CONSOLIDATED

By:/s/ William A. Brandell                   By:/s/ Michael A. Perkis
   -----------------------------                -----------------------------
   William A. Brandell

Title: Vice President Sales                  Title: Vice President/Materials
       --------------------------                   Management
                                                    --------------------------

                                       4
<PAGE>

                                    EXHIBIT A
                                    ---------

12 Ounce Aluminum Can Body
         - 4 prints on metal

202 Diameter Aluminum Stay-On Tab Ends

                                       5
<PAGE>

                                   Exhibit B
                                   ---------
                           Buyer's Filling Locations
                           -------------------------

                                       ##

## The following page is confidential and has been omitted and filed separately
   with the Securities and Exchange Commission in connection with a request for
   confidential treatment of such omitted material.

<PAGE>

                                   Exhibit C
                                   ---------

                                       ##

## The following three pages are confidential and have been omitted and filed
   separately with the Securities and Exchange Commission in connection with a
   request for confidential treatment of such omitted material.

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