LYRIC ENERGY, INC.

              RESTATED CONVERTIBLE PROMISSORY NOTE



$100,000.00                             As of February 4, 1997
                                        Amarillo, Texas  79105


     FOR VALUE RECEIVED, Lyric Energy, Inc., a Colorado
corporation (the "Payor"), having its executive office and
principal place of business at 1013 West 8th Avenue, Amarillo,
Texas 79105, hereby promises to pay to Natural Gas Technologies,
Inc., a Texas corporation (the "Payee"), having an address at 231
Pine Street, Suite 106A, Abilene, Texas 79601 on December 31,
1997 (the "Maturity Date") (unless sooner converted as provided
herein), at the Payee's address set forth above or at such other
place as the Payee shall hereafter specify in writing, the
principal sum of One Hundred Thousand Dollars ($100,000.00 U.S.).

     1.   Conversion.  Upon the latter to occur of (i) Lyric
becoming current on its periodic reports required under the
Securities Exchange Act of 1934, as amended (the "Act") and (ii)
the waiver by Amarillo National Bank (the "Bank") in a form
reasonably acceptable to NGT of the Bank's non-dilution rights
contained in that certain Compromise and Settlement Agreement
dated July 31, 1997 (the "Compromise and Settlement Agreement"),
this Note shall be converted into 203,041,517 shares of the
common stock, $.01 par value, of Payor ("Common Stock").  The
number of shares of Common Stock issuable upon conversion of this
Note may be adjusted in accordance with Section 8 hereof. 

     2.   No Interest; No Prepayment.

          2.1. The unpaid principal amount hereof shall not bear
interest.

          2.2. In the event of conversion of this Note as
provided in Section 1, all principal otherwise due under this
Note shall be forgiven and this Note shall be cancelled.  All
amounts deposited in escrow shall in such event be distributed in
accordance with Section 4 hereof.

          2.3. This Note may not be prepaid in whole or in part
prior to the Maturity Date.

     3.   Representations and Warranties of Payor.

          3.1  The Payor is a corporation duly organized and in
good standing in the State of Colorado.  The Payor has the
corporate power and authority to enter into this Note  and all
related agreements.  The Payor does not own an equity interest in
any other companies and has no subsidiaries.

          3.2  The authorized capital stock of the Payor consists
of 250,000,000 shares of Common Stock, of which 46,958,483 are
issued and outstanding.  The remaining 203,041,517 authorized
shares are unissued as of the date of this Note.  There are no
restrictions or limitations on the ability of the Payor to issue
such shares to the Payee upon conversion of this Note.

          3.3  The Payor is a reporting company under the Act but
is delinquent in the filing of periodic reports required under
such Act.

          3.4  G.E. Stahl is the sole director of the Payor.  The
officers of the Payor are G.E. Stahl, President and Chief
Executive Officer and Kathy Plautz, Secretary.   

          3.5  There are no liabilities, either actual or
contingent, and no actions or claims which have been asserted
against the Payor or which the Payor reasonably believes may be
asserted against the Payor which have not been previously
disclosed to the Payee.

          3.6  The Payor has had no significant business
activities other than the winding up of its affairs since it
transferred all of its operational assets to the Bank pursuant to
the Compromise and Settlement Agreement.

          3.7  The Payor does not have any contract, arrangement
or understanding with any broker, finder or similar agent with
respect to the transaction described in this Note or contemplated
with respect to the Share Exchange.

     4.   Escrow Account.  Pursuant to an Escrow Agreement of
even date herewith, $100,000 is to be deposited by the Payee in
an escrow account under the name of Ronald D. Nickum, Esq.  Upon
maturity of this Note or upon notice from the Payee of any
default under this Note, such funds together with all interest
earned upon such funds shall be paid to the Payee and the parties
shall be relieved of further liability hereunder.  Upon the
satisfaction of the conditions for conversion set forth in
Section 1 hereof, the $100,000 held in escrow shall be paid to
the Payor and all interest paid to the escrow account shall be
paid to the Payee.  The Escrow Agreement sets forth further
provisions concerning the funds deposited in escrow.

     5.   Events of Default.  If any of the following conditions,
events or acts shall occur, this Note shall become immediately
due and payable:

          5.1. The dissolution of the Payor or any vote in favor
thereof by the Board of Directors and stockholders of the Payor;
or

          5.2. The Payor's assignment for the benefit of
creditors, application for or appointment of a receiver, filing
of a voluntary or involuntary petition under any provision of the
Federal Bankruptcy Code or amendments thereto or any other
federal or state statute affording relief to debtors; or the
commencement against the Payor of any such proceeding or filing
against the Payor of any such application or petition, which
proceeding, application or petition is not dismissed or withdrawn
within thirty days of commencement or filing as the case may be;
or

          5.3. The failure by the Payor to make any payment of
principal under this Note; or

          5.4. The merger or consolidation by the Payor with or
into another corporation other than the Payee; or

          5.5. The commencement of a proceeding to foreclose the
security interest or lien in any property or assets to satisfy
the security interest or lien therein of any secured creditor of
the Payor; or
                                
          5.6. The entry of a final judgment for the payment of
money in excess of $5,000 by a court of competent jurisdiction
against the Payor, which judgment the Payor shall not discharge
(or provide for such discharge) in accordance with its terms
within thirty days of the date of entry thereof, or procure a
stay of execution thereof within thirty days from the date of
entry thereof and, within such thirty day period, or such longer
period during which execution of such judgment shall have been
stayed, appeal therefrom and cause the execution thereof to be
stayed during such appeal; or

          5.7. Any attachment or levy, or the issuance of any
note of eviction against the assets or properties of the Payor
involving an amount in excess of $5,000, which attachment, levy
or issuance is not dismissed, bonded or otherwise terminated
within thirty days of the effectiveness of such attachment, levy
or issuance; or

          5.8. The default in the due observance or performance
of any material covenant, condition or agreement on the part of
the Payor to be observed or performed pursuant to the terms of
this Note, and the continuation of such default for thirty days
after written notice thereof, specifying such default, shall have
been given to the Payor by the holder of the Note; then, in any
such event and at any time thereafter while such event is
continuing, the Payee shall have the right to declare an event of
default hereunder ("Event of Default"), provided that upon the
occurrence of an event described in Subsections 5.1, 5.2 or 5.4,
such event shall be deemed to be an Event of Default hereunder
whether or not the Payee makes such a declaration (an "Automatic
Default"), and the indebtedness evidenced by this Note shall
immediately upon such declaration or Automatic Default become due
and payable without presentment, demand, protest or other notice
of any kind, all of which are hereby expressly waived,
notwithstanding anything contained herein to the contrary; or

          5.9. Any breach of the representations and warranties
of the Payor set forth in this Note; or

          5.10.
     The failure of appointment and/or election of the two
directors nominated by the Payee in accordance with Section 9.6
hereof.

     6.   Unconditional Obligation; Fees; Waivers; Other.

          6.1.      The obligations to make the payments provided
for in this Note are absolute and unconditional and not subject
to any defense, set-off, counterclaim, rescission, recoupment or
adjustment whatsoever.

          6.2. No forbearance, indulgence, delay or failure to
exercise any right or remedy with respect to this Note shall
operate as a waiver, nor as an acquiescence in any default, nor
shall any single or partial exercise of any right or remedy
preclude any other or further exercise thereof or the exercise of
any other right or remedy.

          6.3. This Note may not be modified except by a writing
duly executed by the Payor and the Payee.

          6.4. The Payor hereby expressly waives demand and
presentment for payment, notice of nonpayment, notice of dis-

honor, protest, notice of protest, bringing of suit  and dili-

gence in taking any action to collect amounts called for here-

under, and shall be directly and primarily liable for the payment
of all sums owing and to be owing hereon, regardless of and
without any notice, diligence, act or omission with respect to
the collection of any amount called for hereunder or in
connection with any right, lien, interest or property at any and
all times which the Payee had or is existing as security for any
amount called for hereunder.

     7.   Restriction on Transfer.  By its acceptance of this
Note, the Payee acknowledges that this Note has not been
registered under the securities laws of the United States of
America or any state thereof and represents that (i) this Note
has been acquired for investment, and (ii) no interest in this
Note may be offered for sale, sold, delivered after sale,
transferred, pledged or hypothecated in the absence of
registration and qualification of this Note under applicable
federal and state securities laws or an opinion of counsel
reasonably satisfactory to the Payor that such registration and
qualification are not required.

     8.   Standard Antidilution Provisions.  If this Note is
converted pursuant to Section 1 hereof, the number of shares of
Common Stock to be received shall be subject to adjustment as
follows:

          8.1. In the case the Payor shall at any time after the
date of this Note (i) pay a dividend of its capital stock, (ii)
subdivide its outstanding shares of Common Stock, or (iii)
combine its outstanding shares of Common Stock, the number of
shares issuable as a result of the Note conversion provisions in
effect immediately prior to such date shall be multiplied by a
fraction (the "Conversion Ratio"), the denominator of which shall
be the number of shares of Common Stock outstanding on such date
before giving effect to such stock dividend, subdivision or
combination and the numerator of which shall be the number of
shares of Common Stock outstanding after giving effect thereto.

          8.2. If the shares of Common Stock issuable upon
conversion of this Note shall be changed into the same or a
different number of shares of any class or classes of stock,
whether by capital reorganization, reclassification or otherwise
(other than a subdivision or combination of shares or stock
dividend provided for in Section 8.1 above) then, and after such
event, this Note shall be convertible into the kind and amount,
as reasonably determined by the Payor's Board of Directors, of
shares of Common Stock and other securities and property
receivable upon such reorganization, reclassification or other
change in exchange for shares that would have been issued if the
Notes had been converted immediately prior to such
reorganization, reclassification or change, all subject to
further adjustment as provided herein.

          8.3. The adjustments provided for in this Section 8 are
cumulative and shall apply to successive divisions, subdivisions,
combinations, reorganizations or other events contemplated herein
resulting in any adjustment under the provisions of this Section. 

          8.4. In the event of any question arising with respect
to the adjustments provided for in this Section 8, such question
shall be conclusively determined by an opinion of independent
certified public accountants appointed by the Payor (who may be
auditors of the Payor) and reasonably acceptable to the Payee. 
Such accountants shall have access to all necessary records of
the Payor, and such determination shall be binding upon the Payor
and the Payee.

     9.   Miscellaneous.

          9.1. The headings of the various paragraphs of this
Note are for convenience of reference only and shall in no way
modify any of the terms or provisions of this Note.
          
          9.2. All notices required or permitted to be given
hereunder shall be in writing and shall be deemed to have been
duly given when personally delivered, delivered by Federal
Express or other national overnight courier, or sent by
registered or certified mail, return receipt requested, postage
prepaid, to the address of the intended recipient set forth in
the preamble to this Note or at such other address as the
intended recipient shall have hereafter given to the other party
hereto pursuant to the provisions hereof.

          9.3. This Note and the obligations of the Payor and the
rights of the Payee shall be governed by and construed in
accordance with the laws of the State of Texas, including
conflicts of laws, with respect to contracts made and to be fully
performed therein.

          9.4. Any legal suit, action or proceeding arising out
of or relating to this Note shall be instituted exclusively in
the United States District Court for the District of Northern
Texas, unless such court or a superior court rules that such
court lacks jurisdiction over the dispute, in which case action
shall thereafter be initiated in a District Court in Taylor
County, Texas.  The parties hereby waive any objection which they
may have now or hereafter to the venue of any such suit, action
or proceeding and irrevocably consent to the jurisdiction of the
United States District Court for the Northern District of Texas
and the District Court of Taylor County, Texas, in any such suit,
action or proceeding.  

          9.5. This Note shall bind the Payor and its successors
and assigns.

          9.6. Upon conversion of this Note, G.E. Stahl shall, as
sole director of the Payor, fill the vacancies created by the
resignations of two directors in December 1996 with two nominees
designated by the Payee.  Unless otherwise notified by the Payee,
these nominees shall be Brent Wagman and Warren Donohue.


                              LYRIC ENERGY, INC.

                              By:___________________________
                                   G.E. Stahl, President