Question: What is American rock band from Chicago that formed in 1972, with Caught in the Act as a live double album?
Context: Live at Carnegie Hall is a 1976 live double album by British progressive rock band Renaissance.  It presented songs from all of the band's Annie Haslam-era studio albums thus far, including the forthcoming (at the time of the concerts) "Scheherazade and Other Stories". The Roundhouse Tapes is a live double album by Swedish progressive metal band Opeth.  The CD was recorded on November 9, 2006, and was released on November 5, 2007, in Europe, and on November 20, 2007, in the rest of the world.  A two disc DVD version was released on November 10, 2008, and includes exclusive menu music written by Mikael Åkerfeldt and Per Wiberg.  The title is a play on the name of Iron Maiden's first release "The Soundhouse Tapes", as well as the venue where the record was recorded.  Åkerfeldt said, "The Roundhouse concert will always be a very memorable gig for us for many reasons, but most importantly it caught the band at the peak of the "Ghost Reveries" tour". Hot August Night is a 1972 live double album by Neil Diamond ("Hot August night" is also the opening lyric to Diamond's 1969 single "Brother Love's Travelling Salvation Show").  The album is a recording of a Diamond concert on August 24, 1972, one of ten sold-out concerts that Diamond performed that month at The Greek Theatre in Los Angeles.  This also marks the first album released by the newly formed MCA Records (a merging of the Uni, Kapp, and Decca labels). Wilco is an American alternative rock band based in Chicago, Illinois.  The band was formed in 1994 by the remaining members of alternative country group Uncle Tupelo following singer Jay Farrar's departure.  Wilco's lineup changed frequently during its first decade, with only singer Jeff Tweedy and bassist John Stirratt remaining from the original incarnation.  Since early 2004, the lineup has been unchanged, consisting of Tweedy, Stirratt, guitarist Nels Cline, multi-instrumentalist Pat Sansone, keyboard player Mikael Jorgensen, and drummer Glenn Kotche.  Wilco has released ten studio albums, a live double album, and four collaborations: three with Billy Bragg and one with The Minus 5. "This Wheel's on Fire" is a song written by Bob Dylan and Rick Danko.  It was originally recorded by Dylan and The Band during their 1967 sessions, portions of which (including this song) comprised the 1975 album, "The Basement Tapes".  The Band's own version appeared on their 1968 album, "Music from Big Pink".  Live versions by The Band appear on their 1972 live double album "Rock of Ages", as well as the more complete four-CD-DVD version of that concert, "Live at the Academy of Music 1971", and the 2002 Box Set of "The Last Waltz" (the song did not make it into the movie or the original soundtrack album). Styx is an American rock band from Chicago that formed in 1972 and became famous for its albums released in the late 1970s and early 1980s.  They are best known for melding the style of pop rock and hard rock with the power of a hard-rock guitar balanced with acoustic guitar, synthesizers mixed with acoustic piano, upbeat tracks with power ballads, and incorporating elements of international musical theatre. Three Sides Live is a 1982 concert film featuring the English rock band Genesis.  It was released in support of the band's same-titled live double album released in June 1982.  Directed by Stuart Orme, the film features live performances from two shows during the band's 1981 tour of Europe and North America in support of their studio album "Abacab".  The shows are from 28 and 29 November 1981 at the Savoy Theatre and Nassau Coliseum, New York, respectively.  The film includes interviews footage shot backstage and the group travelling with the crew and families.  Some of the featured songs are incomplete due to editing. The Space Ritual Alive in Liverpool and London is a 1973 live double album recorded in 1972 by UK rock band Hawkwind.  It is their fourth album, reached #9 in the UK album charts and briefly dented the "Billboard Top 200", peaking at #179. Caught in the Act is a live double album by Styx, released in 1984.  It contains one new song, "Music Time", which was released as a single, reaching #40 on the "Billboard" Hot 100 charts. Live and Dangerous is a live double album by the Irish rock band Thin Lizzy, released in June 1978.  It was recorded in London in 1976, and Philadelphia and Toronto in 1977, with further production in Paris.  It was also the last Thin Lizzy album to feature guitarist Brian Robertson, who left the band shortly after its release.
Answer: Styx