Mostly 50's era jazz with an increasing frequency to new players. It's simply amazing to sit in the IT Club, in 1958, hear the audience's glasses tinkling with background chatter while Monk plays. Or, the amazing incomparable fidelity of Ted Nash's alto sax. The tone/timbre of Jimmy Guiffre is simply amazing to hear. The rich burnished tones of Joe Lovano, Ben Webster, Chris Cheek, Coltrane, Esaie Cid, Konitz, etc., are just unspeakably ravishing with these speakers. I go to bed at night looking forward to waking up so I can fire up the rig and revel.