Question: Planet X is an instrumental rock supergroup, founded by keyboardist Derek Sherinian and who else?
Sentence (from "Derek Sherinian"): He has released seven solo albums that have featured a variety of prominent guest musicians, including guitarists Slash, Yngwie Malmsteen, Allan Holdsworth, Steve Lukather, Joe Bonamassa, Billy Sheehan, Zakk Wylde and Al Di Meola.
Relevant evidence: No