I know a jazz keys player - she's got a PhD, a Pegasus, and ... HEY! I'm bein' a doofus. Play It With Moxie is filk's own house jazz band, and she's the keys player for them. You'd still want to add an axe (they don't have one that I know of).... but I'm pretty sure they've got a 'bone player, and two sexophones... come to think of it, they've got that alto (she's Canadienne, eh?)... if you hit the bandcamp link off that site you can hear'em. Filk torch jazz. :D