1. A friend who enjoys the same bands, musicians, and genres that you do. In addition, a music bro is usually good at suggesting music you would enjoy.
2. A band member, or simply a friend who plays music along with you.
1. Damn, I wish I had a music bro right now. These CDs are getting old, and these morons are talking about old techno and overrated bands.
2. You play bass too? Awesome, we can totally be music bros!