Excerpts from "The World's Greatest Sinner" soundtrack, composed by Zappa, are audible on both "I Don't Know If I can Go Through This Again" (from Lumpy Gravy) and "Mother People" (from We're Only in It for the Money).
•
Other examples are the albums from avant-garde guitarist Buckethead, Forensic Follies and Needle in a Slunk Stack, released in 2009: both featured songs from several Buckethead albums to make new songs.