Conversation so far:
Was Bob Crewe a singer in the 70's?
Bob Crewe was an American songwriter, dancer, singer, manager, and record producer. In 1975, Crewe wrote and produced disco material for the Eleventh Hour
What songs did Bob Crewe sing?
In the mid-1970s, Bob Crewe and Sir Monti Rock III formed the disco club favorites Disco-Tex and the Sex-O-Lettes, best known for their 1975 successes

Question: Did he write songs?
Self-contained rewrite: Did Bob Crewe write songs?