I have a few musicians that are friends and I usually trust their recommendations, but I've also had the opportunity to meet a few musicians at other concerts. The most famous story my wife and I have is meeting Matthew from Young Empires a long time ago after the We Are Augustines concert at Wrongbar. We didn't know Young Empires at the time, but have seen them since on numerous occasions and we're so happy for their success and the nomination for a 2012 CASBY.
After seeing Young Empires during NXNE, we were hopping on the streetcar home when we struck up a conversation with fan who turned out to be another musician - Shawn is the drummer for Fade Chromatic who we've also now seen play live.
You never know you're going to meet at a concert and the chance to discover some new music.