Conversation so far:
When did MC Hammer begin MC Hammer's music career?
Before Hammer's successful music career (with his mainstream popularity lasting approximately between 1988 and 1998) and his "rags-to-riches-to-rags-and-back saga", Burrell formed a Christian rap music group.
What was the group name?
Holy Ghost Boys.
How long did he stay with them?
CANNOTANSWER.

Question: What else did you find interesting?
Self-contained rewrite: Besides MC Hammer's stay with the band Holy Ghost Boys, what else did you find interesting?