It bothers me that so many great bands break up so that the lead singer can go solo. The music we fell in love with disappears as the singer attempts to prove he or she has "range." Some examples of folks who should've stuck with the band:
Bjork (The Sugarcubes)
Sting (The Police)
Paul McCartney (Wings) [Ha, ha]
Max Collins (Eve 6)
Gwen Stefani (No Doubt)
Glenn Frey, Don Henley, Joe Walsh (The Eagles)
I know you've got a list, too -- share it, won't you?