It's really weird to look up Bill Ham and find there were *two* fairly well-known men by that name, but the one with the long ZZ-style beard is *not* the manager of the band- that guy was a psychedelic artist of some sort. To me, when a guy like Ham or Peter Grant has a "producer" credit, it means "the 800 pound gorilla who throws his weight wherever he likes". And just as a band tends to needs a Billy to drive the art, they also tend to need a Bill to deal with all the other business they can't/don't want to do- at least until they decide maybe they *do* want or need to deal with those things. Which is when it gets weird. It is interesting that Ham seemed to be like a super-fan as manager- he needed to believe it was Billy and Dusty and Frank doing it all on their own even more than a 16 year old kid with a bedroom wall covered in ZZ Top posters.