Derek Sherinian is an American keyboardist of Armenian descent who has toured and recorded for Alice Cooper, Billy Idol, and Joe Bonamassa, among others. He was also a member of Dream Theater from 1994 to 1999, is the founder of Planet X and also one of the founding members of Black Country Communion, Sons of Apollo, and Whom Gods Destroy. He has released nine solo albums that have featured a variety of prominent guest musicians, including guitarists Slash, Yngwie Malmsteen, Allan Holdsworth, Steve Lukather, Joe Bonamassa, Michael Schenker, Steve Vai and Al Di Meola, and extensively drummer Simon Phillips.

Allan Holdsworth was a British jazz fusion and progressive rock guitarist, violinist and composer. He contributed to numerous bands, including Soft Machine, U.K., The Tony Williams Lifetime, Pierre Moerlen's Gong and Bruford, in addition to solo work.