Conversation so far:
What was Charlie Haden's musical style?
Charlie Haden was known for his warm tone and subtle vibrato on the double bass
Who or what is Charles Haden's musical style influenced by?
Charlie Haden's approach to the bass stemmed from his belief that the bassist should move from an accompanying role to a more direct role in group improvisation.

Question: What genre did Haden play?
Self-contained rewrite: What genre did Charlie Haden play?