This guest post was written by David Hyman, a self-proclaimed music junkie and CEO and founder of MOG, a startup that offers both a premium music service and a portal of music content. Before starting MOG, David served as CEO of Gracenote, the world’s largest music database and music-identification service, which sold to Sony for $260 million in 2008. Previously, he was SVP of Marketing at MTV Interactive, and he co-founded