Conversation so far:
What did he do before he was known as MC Hammer?
Before he was MC Hammer, Burrell formed a Christian rap music group with CCM's Jon Gibson (or J.G.) called Holy Ghost Boys.
Was MC Hammer's christian band a success?
The Holy Ghost Boys' song The Wall was Contemporary Christian music's first rap hit ever.

Question: Were the songs successful?
Self-contained rewrite: Were the Holy Ghost Boys songs successful?