This year, Zune is a title sponsor at CMJ - and for us, it's all about music discovery. So what does that mean? It means we're presenting music showcases with some top artists, working with some top music blogs to get awesome coverage, and putting together some amazing playlists that celebrate the best music to come out of CMJ. Over its 20 year history, CMJ has been instrumental in launching the careers of bands like Arcade Fire, The Hold Steady, Mars Volta, Modest Mouse, The Yeah Yeah Yeahs...