I didn't think they where using live musicians down there anymore, I thought all the shows had been computerized and Trump had established the norm of closing down all the casino bars to keep people playing at the machines. I knew showboat was still doing there dixie land thing on the casino floor.
last time I was down there (2-3 yrs)spent an hour walking the b-walk trying to find a casino lounge to have a drink.
There's a lot of fine hardcore jazz players around this area, you should have no trouble finding someone to help you out.