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Joe's Garage was originally released in 1979 in two separate parts; Act I came first, followed by a two-record set containing Acts II & III. Rykodisc's reissue puts all three acts together on two CDs. Joe's Garage is generally regarded as one of Zappa's finest post-'60s conceptual works, a sprawling, satirical rock opera about a totalitarian future in which music is outlawed to control the population. The narrative is long, winding, and occasionally loses focus; it was improvised in a weekend, some of it around previously existing songs, but Zappa manages to make most of it hang together. Acts II & III give off much the same feel, as Zappa relies heavily on what he termed "xenochrony" --previously recorded guitar solos transferred onto new, rhythmically different backing tracks to produce random musical coincidences. 
http://www.allmusic.com/album/joes-garage-acts-i-ii-iii-mw0000196440