I would not take canned backing music into an open mic until I knew what kind of folks were there and what they expected (OK, I would never take canned backing tracks to an open mic, period! But that's just me). If the crowd expects 100% live performance, having backing tracks will just allow you to make a very bad first impression.


Now at bandcamp: Crows Say Vee-Eh @ bandcamp or soundcloud: Kevin @ soundcloud