Conversation so far:
What did Dr. Dre do in 1984?
He became a DJ and also joined a musical group called World Class Wreckin' Cru
Did World Class Wreckin' Cru record any singles or albums?
They have five singles and two albums.

Question: Did it have any hit singles?
Self-contained rewrite: Did World Class Wreckin' Cru have any hit singles?