question: What band formed in Houston, Texas had early experimentation in synthesizer backing on certain tracks?
answer: ZZ Top
context: Title: El Loco
  Passage: El Loco is the seventh studio album by the American rock band ZZ Top, released in 1981.  The title means "The Crazy One" in Spanish.  The band's guitarist/singer Billy Gibbons has said that the recording of this album was the first time the three members of the band were isolated from one another in the studio, rather than recording simultaneously in the same room.  It also foreshadowed ZZ Top's synthesizer-driven direction later in the decade, with early experimentations in synthesizer backing on certain tracks.
  Title: Friends and Legends
  Passage: Friends and Legends was the second solo album from Michael Stanley.  The album title refers to the backing musicians accompanying Stanley on the album, which was recorded at Applewood Studios in Golden, Colorado.  The basic band on all tracks was Barnstorm, composed of Joe Walsh on lead guitar and synthesizer, Joe Vitale on drums, flute, synthesizer and backing vocals, and Kenny Passarelli on bass.  In addition, three members of Stephen Stills' Manassas performed: Paul Harris on keyboards, Joe Lala on percussion and Al Perkins on pedal steel guitar, and the band also included saxophonist David Sanborn.  Among the backing vocalists were Richie Furay and Dan Fogelberg.  In keeping with the collaborative spirit, J. Geils assisted with production of the saxophone tracks.
  Title: ZZ Top
  Passage: ZZ Top is a rock band formed in 1969 in Houston, Texas.  The band has, since 1970, consisted of bassist and lead vocalist Dusty Hill, guitarist and lead vocalist Billy Gibbons (the band's leader, main lyricist and musical arranger), and drummer Frank Beard.  "As genuine roots musicians, they have few peers," according to former musician, critic and collector Michael "Cub" Koda.  "Gibbons is one of America's finest blues guitarists working in the arena rock idiom [...] while Hill and Beard provide the ultimate rhythm section support."
  Title: Editors (band)
  Passage: Editors are an English rock band, formed in 2002 in Birmingham.  Previously known as Pilot, The Pride and Snowfield, the band currently consists of Tom Smith (lead vocals, guitar, piano), Russell Leetch (bass guitar, synthesizer, backing vocals), Ed Lay (drums, percussion, backing vocals), Justin Lockey (lead guitar), and Elliott Williams (keys, synthesizers, guitars, and backing vocals).
  Title: Subhuman Race
  Passage: Subhuman Race (stylized sUBHUMAN rACE) is the third studio album by American heavy metal band Skid Row, released on March 28, 1995 by Atlantic Records.  "Subhuman Race" is the last Skid Row album with singer Sebastian Bach and drummer Rob Affuso.  It is regarded as the band's heaviest record.  Despite obtaining gold status and receiving positive reviews, it was not as successful as the band's first two albums.  Certain tracks from the album were remixed for the band's compilation "", given more tender, slightly cleaner mixes to fit better with the other tracks.  To promote "Subhuman Race", Skid Row supported Van Halen on the North American tour.
  Title: The Notorious Byrd Brothers
  Passage: The Notorious Byrd Brothers is the fifth album by the American rock band the Byrds and was released in January 1968 on Columbia Records ("see" 1968 in music).  Musically, the album represents the pinnacle of the Byrds' psychedelic experimentation, with the band blending together elements of folk rock, psychedelic rock, country music, electronic music, baroque pop and jazz on many of the songs.  Of these disparate styles, the subtle country and western influences evident on a number of tracks pointed towards the full-blown country rock direction that the band would pursue on their next album.  In addition, "The Notorious Byrd Brothers" saw the band and record producer Gary Usher making extensive use of a number of studio effects and production techniques, including phasing, flanging, and spatial panning.  The Byrds also introduced the sound of the pedal steel guitar and the Moog modular synthesizer into their music for the first time on the album, making it one of the first LP releases on which the Moog appears.
  Title: Sophisticated Soul
  Passage: Sophisticated Soul is the eighth album issued by Motown girl-group The Marvelettes.  It is the first album to feature Anne Bogan who replaced Gladys Horton in 1967, although Horton's voice is featured on one of the tracks.  Like many Motown albums produced in the late 1960s, "Sophisticated Soul" featured backing from The Andantes, Motown's premiere backing group, on certain tracks, others feature Bogan and Katherine Anderson.
  Title: Angels and Agony
  Passage: Angels and Agony are a Dutch futurepop band consisting of vocalist Reinier Kahle, guitarist Erik Wierenga, DJ Marco van Belle on synthesizer and backing vocals and Fried Bruggink as sound engineer and drummer.  The band formed in 1995 and produced two EPs before its first full album, "Eternity" (2001).  "Eternity" was produced by VNV Nation's Ronan Harris.  Other high-profile collaborations include Axel Ermes of Girls Under Glass, Diorama, and SITD The band's current record label (since "Eternity", 2001) is Out of Line, a German label of industrial- and synthpop-oriented electronic bands.  Metropolis Records is the band's US distributor since 2004.
  Title: Magic Giant
  Passage: Magic Giant (often stylized as MAGIC GIANT) is an American indie folk band formed in Los Angeles, California in early 2014.  The group consists of Austin Bisnow (lead vocals, cello, synthesizer, percussion), Zambricki Li (banjo, fiddle, viola, cello, harmonica, mandolin, octave mandolin, acoustic guitar, dobro, lap steel, backing vocals) and Zang (acoustic guitar, cello, bass, percussion, backing vocals).
  Title: Mirrored
  Passage: Mirrored is the debut studio album by American experimental rock band Battles.  It was released on May 14, 2007 in the United Kingdom, and on May 22, 2007 in the United States.  "Mirrored" marked the first album in which the band incorporated prominent vocals and lyrics into their songs, as previous extended plays by the band had been completely instrumental, with the exception of occasional beatboxing and wordless vocals on certain tracks.  The first single from the album, "Atlas", was released in the United Kingdom on April 2, 2007.  "Mirrored" was released to wide critical acclaim and appeared on year-end best album lists from several publications, including "Time", "NME", "The Guardian", and Pitchfork Media.
citations: El Loco ZZ Top