Question: What American is described as one of the most innovative and diverse rock musicians of his generation and released one of the earliest double albums in rock music?

Context paragraphs:
Double Trouble (band): Double Trouble is an American blues rock band from Austin, Texas, formed by guitarist/singer Stevie Ray Vaughan in 1978.  The group was active throughout the 1980s and responsible for reviving the blues, inspiring many later blues and rock musicians.  Formed in Austin, Texas, by 1985 the group consisted of Vaughan, Chris Layton (drums), Tommy Shannon (bass), and eventually Reese Wynans (keyboards).  While with Vaughan the band was billed Stevie Ray Vaughan and Double Trouble.  Rooted in blues and rock music, the group worked in many genres ranging from ballads to soul, often incorporating jazz and other elements.

Freak Out!: Freak Out!  is the debut studio album by the American rock band the Mothers of Invention, released June 27, 1966, on Verve Records.  Often cited as one of rock music's first concept albums, the album is a satirical expression of frontman Frank Zappa's perception of American pop culture.  It was also one of the earliest double albums in rock music (Bob Dylan's "Blonde on Blonde" was originally scheduled to precede it by a week, but its release was delayed until more than a month later), and the first 2-record debut.  In the UK the album was originally released as an edited single disc.

Frank Zappa: Frank Vincent Zappa (December 21, 1940 – December 4, 1993) was an American musician, composer, activist and filmmaker.  His work was characterized by nonconformity, free-form improvisation, sound experiments, musical virtuosity, and satire of American culture.  In a career spanning more than 30 years, Zappa composed rock, pop, jazz, jazz fusion, orchestral and "musique concrète" works, and produced almost all of the 60-plus albums that he released with his band the Mothers of Invention and as a solo artist.  Zappa also directed feature-length films and music videos, and designed album covers.  Publications such as "Ultimate Classic Rock" and "The Independent" have described him as one of the most innovative and stylistically diverse rock musicians of his generation.

Vegas Rocks! Magazine: VEGAS ROCKS!  Magazine is a rock music magazine founded in August 2004 by Sally Steele.  It covers rock music currently on showcase in the Las Vegas, NV area especially '80s rock music artists.  "Vegas Rocks!  Magazine" is a bi-monthly publication available in print in the Las Vegas, NV area and also in select areas of California and Arizona, and online.  Beginning in 2010, the magazine began hosting its yearly "Vegas Rocks!  Magazine Music Awards" event in order to honor rock musicians.

Double album: A double album (or double record) is an audio album which spans two units of the primary medium in which it is sold, typically records and compact disc.  A double album is usually though not always released as such, because the recording is longer than the capacity of the medium.  Recording artists often think of double albums as comprising a single piece artistically; however, there are exceptions such as John Lennon's "Some Time in New York City" and Pink Floyd's "Ummagumma" (both examples of one studio record and one live album packaged together) and OutKast's "Speakerboxxx/The Love Below" (effectively two solo albums, one by each member of the duo).  Another example of this approach is "Works Volume 1" by Emerson Lake and Palmer, where side one featured Keith Emerson, side two Greg Lake, side three Carl Palmer, and side four was by the entire group.

Proto-prog: Proto-prog (short for "proto-progressive") is the first wave of British progressive rock musicians who branched from psychedelia or the advanced music that slightly predates the full-fledged prog era.  Progressive rock (originally "progressive pop") evolved from psychedelic/acid rock music, specifically a strain of classical/symphonic rock led by the Nice, Procol Harum, and the Moody Blues.  Proto-prog musicians harnessed modern classical and other genres usually outside of traditional rock influences, longer and more complicated compositions, interconnected songs as medley, and studio composition.

Great White Wonder: Great White Wonder, or GWW, is the first notable rock bootleg album, released in July 1969, and containing unofficially released recordings by Bob Dylan.  It is also the first release of the famous bootleg record label Trademark of Quality (or TMQ).  Several of the tracks presented here were recorded with The Band in the summer of 1967 in West Saugerties, New York, during the informal sessions that were later released in a more complete form in Dylan's 1975 album "The Basement Tapes".  Much of the other material consists of a recording made in December 1961 in a Minnesota hotel room (referred to as the "Minnesota hotel tape"), studio outtakes from several of Dylan's albums, and a live performance on "The Johnny Cash Show".  It was the first time that these previously unreleased recordings came to the market; many more would be released in similar formats over the coming years, though most were single albums, not double albums like this record.

Back from the Grave (series): Back from the Grave is a series compilation albums of 1960s garage rock created and compiled by Tim Warren and released by Crypt Records.  The series originally consisted of eight LP records released between 1983 and 1992.  Volumes seven and eight were double albums.  Starting in 1994, the series was reissued on compact disc.  Due to the longer playing times offered by CDs, the first seven volumes were contained on four discs, save for a few tracks that were omitted.  And, while all of the songs on the first four CDs are included on first seven vinyl albums, they do not necessarily correspond to the individual LPs bearing their same titles.  However, the Volume 8 CD corresponds almost directly its LP double-LP counterpart, but with the addition of four bonus tracks not included on the LP.  The eight vinyl albums are titled consecutively "Back From The Grave, Volume 1, Volume 2, Volume 3, Volume 4, Vulume 5, Volume 6, Volume 7, Volume 8, Volume 9, and Voume 10."  In similar fashion the five CDs are titled "Back from the Grave, Volume 1, Volume 2, Volume 3, Volume 4, Volume 8, and Volumes 9 & 10" (which are both included on one CD).  There are no volums 5, 6, or 7 for the CDs.  Two separate LPs for Volume 9 and 10 were released in 2015 as well one CD, released the same year, which combines Volumes 9 and 10 onto one double-length disc.

Alternative rock: Alternative rock (also called alternative music, alt-rock or simply alternative) is a style of rock music that emerged from the independent music underground of the 1980s and became widely popular in the 1990s.  In this instance, the word "alternative" refers to the genre's distinction from mainstream rock music.  The term's original meaning was broader, referring to a generation of musicians unified by their collective debt to either the musical style or simply the independent, DIY ethos of punk rock, which in the late 1970s laid the groundwork for alternative music.  At times, "alternative" has been used as a catch-all description for music from underground rock artists that receives mainstream recognition, or for any music, whether rock or not, that is seen to be descended from punk rock (including some examples of punk itself, as well as new wave, and post-punk).

Hüsker Dü discography: The discography of Hüsker Dü, an American punk rock band, consists of six studio albums, two live albums, one compilation album, two extended plays, and ten singles.  The band was formed by Bob Mould (guitar, vocals), Grant Hart (drums, vocals), and Greg Norton (bass guitar) in 1979.  Their first album release was "Land Speed Record", a live album released through New Alliance Records.  The band released its first studio album, "Everything Falls Apart" on its own label (Reflex Records) the following year.  Hüsker Dü signed with SST Records in 1983, and released its next three albums with that label.  The Warner Music Group released the band's last two studio albums.  Hüsker Dü broke up in 1987.  The band released 5 albums, including two double albums, between January 1984 and January 1987.

Supporting paragraphs: Freak Out! Frank Zappa
Answer: Frank Vincent Zappa