Yes were one of the few progressive rock bands of the early '70s that parlayed their classical approach to rock music into mainstream success.

While their peers wrote long symphonic pieces about interstellar dragons for a loyal fan base of about, oh, three dozen people, Yes hit the big time by adding some traditional pop touches to their radio-friendly songs.

Songs like 'I've Seen All Good People' and 'Roundabout' are still popular classic-rock cuts, and for good reason. They're great songs that break the barriers defined by pretentious prog.