Question: Pylon and Bullet for My Valentine, is what type of musical organization?

Context articles: Jeff Killed John (EP)
Pylon (band)
Matthew Tuck
Rare Cuts (EP)
Argonotes
David W. Tucker
Pylon station
Handel and Haydn Society
Bullet for My Valentine
League of American Orchestras

Jeff Killed John is the last EP by Welsh nu metal band Jeff Killed John, before changing their name to Bullet for My Valentine.
 This EP also marks the last recorded material with bassist Nick Crandle, before Jason James replaced him.
 Many song elements from this EP would be reworked into later tracks for Bullet for My Valentine music: "Routine Unhappiness" contains riff elements that would later become "Tears Don't Fall," with lyrical content that would appear on "10 Years Today;" "Nation2Nation" would eventually become the bonus track "Turn to Despair" on the Japanese edition of "Hand of Blood;" and "All These Things I Hate (Revolve Around Me)" is an early demo of the song of the same name that would eventually appear on Bullet for My Valentine's debut album "The Poison."
Pylon were an American rock band from Athens, Georgia.
 The band's danceable sound, a blend of new wave, post-punk, jangle pop, alternative rock and funk rock, influenced the Athens music scene and the 1980s American pop underground.
 AllMusic wrote that Pylon's "role as elder statesmen of the alternative rock explosion is unassailable".
Matthew "Matt" Tuck (born 20 January 1980) is a Welsh musician.
 He is the lead vocalist and rhythm guitarist in the Welsh heavy metal band Bullet for My Valentine.
 He and the other 3 members of his old band founded "Jeff Killed John" in 1998, but after bassist Nick Crandle left in 2003, the band was renamed to Bullet for My Valentine.
 He is also a singer and guitarist in the supergroup AxeWound, which was formed in 2012.
 He also plays piano, drums, keyboard, and harmonica.
 He did a collaboration with Max Cavalera (Soulfly, Cavalera Conspiracy, ex-Sepultura) and with Apocalyptica in the song "Repressed".
Rare Cuts is an EP by Welsh metalcore band Bullet for My Valentine, released in Japan only.
 "Rare Cuts" contains bonus tracks from Bullet for My Valentine's album "The Poison".
 It includes an acoustic version of the band's song "Tears Don't Fall".
Argonotes, the unofficial band of the Toronto Argonauts is an all volunteer organization committed to bringing quality musical entertainment and a "traditional football atmosphere" to all Argonauts home football games.
 Comprising more than 50 musicians on most game days, Argonotes is the largest musical organization associated with the CFL.
David W. Tucker (1929–2003) was a jazz trombonist, music educator, composer of band and orchestral music, record producer, and marching band arranger, most renowned as the director of the University of California Jazz Ensembles from 1969 until 1985.
 Under his direction, the organization expanded to become the largest musical organization on the campus of the University of California, Berkeley, had an international reputation resulting from foreign tours, and sponsored the Pacific Coast Collegiate Jazz Festival.
 Numerous student members of the organization have become renowned jazz musicians, composers, and music educators.
The pylon station is a type of deep underground subway station.
 The basic distinguishing characteristic of the pylon station is the manner of division of the central hall from the station tunnels
The Handel and Haydn Society, familiarly known as H+H, is an American chorus and period instrument orchestra based in Boston, Massachusetts.
 Founded in 1815, it is the third oldest musical organization in the United States after the Stoughton Musical Society (founded in 1786) and the U.S. Marine Band (founded 1798), and the oldest continually performing arts organization in the United States.
Bullet for My Valentine, often abbreviated as BFMV or B4MV, are a Welsh heavy metal band from Bridgend, formed in 1998.
 The band is composed of Matthew Tuck (lead vocals, rhythm guitar), Michael Paget (lead guitar, backing vocals), Michael Thomas (drums) and Jamie Mathias (bass guitar).
 Former members include Nick Crandle and Jason James; both were on bass.
 They were formed under the name Jeff Killed John and started their music career by covering songs by Metallica and Nirvana.
 Jeff Killed John recorded six songs which were not released; two of these tracks were reworked later in their career as Bullet for My Valentine.
 Financial difficulties dictated the name change, which was followed by a change in music direction.
 In 2002, the band secured a five-album deal with Sony BMG.
 The band has stated that their music is influenced by classic metal acts such as Metallica, Iron Maiden and Slayer.
 The band is part of the Cardiff music scene.
The League of American Orchestras, formerly the American Symphony Orchestra League, is a North American Musical Organization consisting of a network of approximately 800 orchestras.
 “Dedicated to helping orchestras meet the challenges of the twenty-first century,” the League consists of leading symphony and philharmonic orchestras, collegiate orchestras, community ensembles, and youth and student ensembles.
 The only national organization devoted and focused on elevating the orchestra industry, the League was founded in 1942 and later chartered by Congress in 1962.
 The League creates a network of all facets of the industry, including administrators, managers, board members, business partners, volunteers, and musicians.
 Each year this organization presents two awards: the Gold Baton Award and the Helen M. Thompson Award.
 The League affects the orchestral world through several outreach experiences, dedicated advocacy to music education and especially orchestral education, and maintaining and communicating a breadth of information and pertinent topics in publications.
 It has also developed detailed antitrust policy and guidelines in order to comply with the landscape of the industry.
 The League is a leading force in work on legislation regarding orchestras and support for the arts.