With a body of work spanning nearly seven decades, England's Deep Purple are bona fide classic rock royalty. Along with Cream, Black Sabbath, and Led Zeppelin, they defined hard rock and early heavy metal. Though their lineup has constantly evolved, Deep Purple effectively made music a career for guitarist Ritchie Blackmore, bassist Roger Glover, vocalists Ian Gillan and David Coverdale, and organist/composer Jon Lord.