Question: What is the name of Canadian vocalist and songwriter who is in both Explorers Club and Dream Theater?
Sentence (from "Explorers Club (band)"): Explorers Club is a progressive metal/rock supergroup headed by the Gardner brothers of Magellan featuring, among others, James LaBrie, John Petrucci of Dream Theater, and Derek Sherinian (then Dream Theater), D.C. Cooper (Royal Hunt), drummer Terry Bozzio, Billy Sheehan (bassist of UFO, Mr. Big and Steve Vai fame), James Murphy (from the metal scene)
Relevant evidence: Yes