If you pass by Downtown Music to get to ("no refunds") J&R, you will have made a grievous error. DTM is a NYC classic. Shopping and browsing does not get any better, and Bruce and Manny are very friendly people. If you don't like the music, then strike up a chat with either of them, they would probably want to know what they could put on to make you happy and relaxed.
Please, J&R is only necessary if the prices in your mall back home are too high.
Take the opportunity in NYC to visit a real music store - DTM, Other Music, Norman's, Kim's, the jazz dept. at Tower or even Virgin.