My first thought was The BEATLES. King Crimson went through several changes. Clapton has a bit of a diverse catalog though he seems to have settled down into the elder bluesman role lately. Jeff Beck has some diversity too... some of it so diverse it takes some getting used to. Fleetwod Mac went through several different stages that are really different from the others. I still like the Bob Welch era the best.
Change is good. It seems like if a musician or group stays on the same ground for too long they cannot change, the fans wont support them. C'est La Vie...
J