the definition of maverick is "Someone who refuses to play by the rules. he/she isn't scared to cross the line of conformity. but their unorthodox tactics get results!"
so a jazz maverick is "a jazz musician who only play by his rules and his/her jazz skills will get them far"
Howard Moon of the mighty boosh is seen as a jazz maverick.
AKA julian barrat
A seriously cool guy
Adam: "Dan your so cool"
Dan: "Yes, you could say im a Jazz Maverick of sorts.."