Gregg Rolie

Two-time Rock & Roll Hall of Fame inductee also built the foundation for Santana.

Toto's Steve Lukather also joined them for a cover of "Black Magic Woman."

Prospect of shows with band's original keyboardist discussed as feud with Jonathan Cain intensifies.

He bowed out in 1980, three years after Steve Perry arrived.

Six men each have sang lead and played drums with the band onstage. And some of the numbers are closer than you might think.