Conversation so far:
What is Stax?
When Sam & Dave arrived at Stax, they worked with producer & engineer Jim Stewart and songwriters.
What did they make at Stax?
Hayes and Porter wrote and produced the duo's biggest hits (although they did not receive production credits until the Soul Men LP and singles).
What singles were produced there?
) "You Don't Know Like I Know" hit #7 R&B in 1966.

Question: What was their most popular song?
Self-contained rewrite: What was  Sam & Dave most popular song?