For NU you’re maybe competitive if you applied to Bienen given your musical talent, to all the other schools at NU I’d say your chances aren’t impossible but low. I don’t know about Columbia so I can’t judge but generally they have an even lower acceptance rate. Your GPA and test scores are a little low for RD, but a good essay might balance your profile out. Are you a Junior or Senior? As puzzled123 said, if you’re a junior try to improve test scores and GPA and consider ED for your favorite school to greatly improve your chances; If you’re a Senior, your stats are ok but your probably only competitive if you applied to a music school and showed a lot of interest in your essays.