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
Did Bob Crewe write songs?
Bob Crewe wrote songs like My Eyes Adored You and Lady Marmalade
Did Bob Crewe's songs do well on the music charts?
Bob Crewe's songs My Eyes Adored You and Lady Marmalade became back-to-back #1 records in 1975.

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