Conversation so far:
Why did The Mothers of Invention break up?
In late 1969, Zappa broke up the band. He often cited the financial strain as the main reason, but also commented on the band members' lack of sufficient effort.
What else did The Mothers of Invention do in Los Angeles?
Recorded from September 1967 to September 1968 and released in early 1969, Uncle Meat, the final release by the original Mothers, was a double album of varied music.

Question: What was their most popular hit?
Self-contained rewrite: What was The Mothers of Invention's most popular hit?