Conversation so far:
Did Ozzie get an education in Music?
his entertainment career as a band leader.
Did he have a band or was he always a leader?
He formed and led the Ozzie Nelson Band.
what kind of music did he play in his band?
CANNOTANSWER.
Was his band successful?
unsold copies.

Question: Did he have a group on members or was it just him?
Self-contained rewrite: Did Ozzie Nelson have a group of members or was Ozzie Nelson just him?