One of the longest running and most prolific of hard rock/proto-heavy-metal bands, Deep Purple appeared in the wake of the psychedelic era, sporting a harder sound than anything that had come before. The classic 1970s lineup (featuring virtuoso guitarist Ritchie Blackmore, wailing tenor Ian Gillan, and classically influenced keyboardist Jon Lord) established the template for countless metal bands that followed in their wake. They went through numerous lineup changes over the years, with singers David Coverdale and Joe Lynn Turner and guitarists Tommy Bolin and Steve Morse all passing through the ranks. Since the 1980s, sporadic reunions have found key members returning to the fold.