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Guitar is a 1988 album by Frank Zappa. It is the follow-up to 1981's Shut Up 'n Play Yer Guitar; like that album it features Zappa's guitar solos excerpted from live performances, recorded between 1979 and 1984. It garnered Zappa his 6th Grammy nomination for "Best Rock Instrumental Performance".
Guitar was originally intended to be a 3-record box set (like Shut Up 'n Play Yer Guitar), but Zappa decided, with this release, to start using compact discs as his primary media rather than records. As such, it was Zappa's first album to be released simultaneously on vinyl and CD. The double CD, released on Rykodisc in the US and Zappa Records in Europe, contained all 32 tracks while the double LP was pared down to 19 tracks and released on Zappa's Barking Pumpkin label (US) and Zappa Records (EU).
More: 
https://en.wikipedia.org/wiki/Guitar_%28Frank_Zappa_album%29
http://www.allmusic.com/album/guitar-mw0000195624