Conversation so far:
How did Muddy Waters start his career?
In August 1941, Alan Lomax went to Stovall, Mississippi, on behalf of the Library of Congress to record various country blues musicians. Muddy Waters was one of those musicians.
What happened when Alan Lomax visited Muddy Waters?
Lomax brought Muddy Waters's stuff down and recorded me right in my house, and when he played back the first song I sounded just like anybody's records.“
Was Muddy Waters given a contract?
Eventually Muddy Waters was but not by Alan Lomax.
What year did Alan Lomax visit Muddy Waters?
Lomax visited Muddy Waters in August 1941.
What did Muddy Waters performing in rowdy clubs lead to?
Playing in the rowdy clubs gave Muddy Waters the opportunity to play in front of a large audience.
Did Muddy Waters gain popularity?
Muddy Water's I Can't Be Satisfied and I Feel Like Going Home became hits, and his popularity in clubs began to take off.
What happened to Muddy Waters in 1944-1945?
In 1944, Muddy Waters bought his first electric guitar and formed his first electric combo. He said, When I went into the clubs, couldn't nobody hear you with an acoustic.“

Question: What or who was included in the combo?
Self-contained rewrite: What or who was included in Muddy Waters' 1964 combo?