Pretty good for a first go 
I should say that haven't ever tried this sort of photography, but here are some general comments anyway.
Firstly, you seem to have been having difficulty with your white balance. I'm a JPEG shooter normally, but would recommend that you shoot RAW in these sort of conditions as it gives you much greater scope to correct any WB problems after the event.
Secondly, it seems that you were having difficulty getting a clear shot - particularly of the drummer. Its a shame actually because the second photo would have been brilliant if you'd zoomed out a little and had a clear shot.
Hope this helps 