To start and (we're talking strictly commercial here): The really old - Rod Stewart left The Faces in the dust, but the other members had little trouble finding work after the breakup. Peter Frampton years after Humble Pie, although a strong case could be make that Frampton Comes Alive was a fluke. Robin Trower may not have racked up huge sales, but in terms of longevity, Procol Harum is but a distant memory. On the fence with Peter Gabriel. His solo work sold more than his output when he was a member of Genesis, but then their sales also increased after he left as well. The more recent - Beyonce without Destiny's Child.