Conversation so far:
What was Willie Dixon like in adulthood?
Dixon was a man of considerable stature, standing 6 feet 6 inches tall and weighing over 250 pounds.
What was Willie Dixon's profession in adulthood?
Boxing
Was Willie Dixon good at boxing?
Dixon was successful, winning the Illinois State Golden Gloves Heavyweight Championship (Novice Division) in 1937.
What happened with Willie Dixon's boxing career?
Willie Dixon became a professional boxer and worked briefly as Joe Louis's sparring partner, but after four fights he left boxing in a dispute with his manager over money.
What did Willie Dixon do next in his life?
Dixon met Leonard Caston at a boxing gym, where they would harmonize at times.
Was Willie Dixon a musician in adulthood?
Dixon performed in several vocal groups in Chicago, but it was Caston that persuaded him to pursue music seriously.
Did Willie Dixon play any musical instruments in adulthood?
Guitar and bass

Question: Was he a solo artist or ever part of a group?
Self-contained rewrite: Was Willie Dixon a solo artist or ever part of a group?