Biz Markie has been all about the biz lately. The old school rapper has landed a new gig with TuneUpMedia.com to promote the company's new software that cleans up digital music libraries. In TuneUp's first major commercial, Biz plays the role of Captain Tune Up showing how the software works along side co-star Andy Milonakis.

TuneUp's software allows iTunes users to add information to mislabeled tracks, find missing cover art and present useful, fun and contextual information.

In other news, Biz Markie keeps the checks rolling in from his popular 1989 hit "Just A Friend." Radio Shack licensed the song for a series of their 2009 holiday commercials. Last year Heineken also enlisted the Biz and the fammed track for a national campaign ad.