I believe only in the restaurants. Music is local, sad songs about the heroes of the Pirin mountain. Musicians have normally been drunk since the beginning of winter season and this will go on until spring. At least this is how Bansko was when I was a student and we used to go to the Academica hotel. I dont think they have live music bands the way you would like to see them. There are some in Sofia but I guess you are not staying there...