What do you plan to do with your music degree? Unless it is teach music or go into academic research, could be a less than optimal use of funds/time. If your interests are playing whatever instrument(s) you play now, by all means continue to do so. Don't need to major in music to take the classes, join school orchestra, etc.
Just consider the value of a music degree...might make for a great 4 years but then what? If I'm missing something, would welcome more information. No harm in going back to school, to be sure, but maybe studying something a little more marketable, and perhaps having a minor in music would be a better plan. If you have a second passion besides music (history? economics? business? psychology?) consider that a possible course of study.
I'm sorry but I know way too many people whose music degrees, years in culinary school, etc. basically amount to huge financial burdens and ultimately poor choices. Happiest guy I know wanted to be a chef, but studied business in college while apprenticing at local restaurants, worked for a couple years after college in the financial field and saved enough to start his own restaurant. Does what he likes but realizes real world concerns. Now if you're independently wealthy go for whatever makes you happy...