Hello doug,
i hear the interferon treatment is just like chemotherapy. So the same symptoms would apply like fatigue, nausea, hair loss etc.
Coincidentally, my husband and myself also play in a band. He is the drummer. I honestly don't think he would have the energy to play (and work his day job) if he were on the interferon treatment. I hear it's pretty rough.
If I were in your shoes, I wouldn't do it. But that's something you have to decide for yourself.
Your doctor should be able to provide you advice as far maintaining your energy levels through diet, plenty of rest, etc.
Good luck in whatever you decide.