Bun B and Rap-A-Lot Records are looking for the nation's next rap superstar, and have teamed with Microsoft Zune to launch the ultimate contest for aspiring artists to win a chance at stardom. Through July 1, entrants can download an exclusive Bun B instrumental Mp3 track from Zune Marketplace, record their own original rap over the track, and submit their demo to Rap-A-Lot Records. At the completion of the contest one winner will receive an expense paid trip to Houston, TX where they will record the track in a studio with Bun B and have a chance at an exclusive recording contract. The winner's track will also be featured as a free download on Zune Marketplace in September...