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.
Did World Class Wreckin' Cru have any hit singles?
Their song Surgery was a big hit.

Question: What happened in 1985?
Self-contained rewrite: What happened in 1985 to Doctor Dre?