Actually, in the early days, before Davie Paton and Billy Lyall left to form Pilot (and later go on to be part of the Alan Parsons Project; Paton also worked with Kate Bush and Elton John) the Bay City Rollers were a pretty decent group too.
Sweet - best known for cheesy but catchy glam-pop - but like several bands of that ilk (Slade and Mud for example) they could actually play and were, when not earning a living playing cheesy pop, pretty good bands.
Anyway, RIP Steve.