Conversation so far:
What type of music did Marvin Gaye record for the album, Let's Get It On?
Marvin Gaye proceeded to record some more politically conscious material at the Golden World Records studio, known as Motown's Studio B, to be featured on Let's Get It On.

Question: What was one of his famous lyrics?
Self-contained rewrite: What was one of Marvin Gaye's famous lyrics?