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.
Were the Holy Ghost Boys songs successful?
The Holy Ghost Boys' song The Wall was Contemporary Christian music's first rap hit ever.
What label produced his music?
MC Hammer released his first album on his own label, and then he signed with Capitol records.
Did MC Hammer have any other record labels in his entertainment career besides Capitol?
Around 1993 MC Hammer left Capitol records for Giant.
Was Capitol and Bustin' the only two record labels he worked with?
MC Hammer worked with Capitol / EMI records, Giant / Oaktown, and his own labels for his music career.
Was all of MC Hammer's music released?
MC Hammer produced and recorded many rap songs that were never made public.

Question: Where are they available?
Self-contained rewrite: Where are Mc Hammer's unreleased songs available?