A musical band in a dream represents harmony. It can symbolize a need for you to harmonize different aspects of your personality so you can be a more well-balanced individual. It can also represent a desire for harmony among friend, family or coworkers.
A band that is playing badly represents conflict – a lack of harmony.
If you dream that you are playing in a band, you have hidden talents that you want to express. If you are applauded for your performance in your dream, you want more recognition from others in waking life.
If you are playing in a band in a dream, but you don’t remember what song you are supposed to be playing or can’t play your instrument correctly, you are afraid of being unprepared for an important occasion in real life.