2012 was a good year for IamSu! The Bay Area producer-rapper released two mixtapes, KILT and $uzy 6 $peed, earned a guest spot on E-40‘s “Function” and basically helmed Wiz Khalifa‘s Cabin Fever 2 mixtape with majority vocal and production credits (under his outfit, The Invasion). Now, with an XXL Freshmen 2013 nomination (vote here) to boot, IamSu! is poised for a breakout year in the ’13. Before we hear any official releases or collaborations (or major label deals, perhaps?), the Richmond native treats us to this freebie, “I Be On That,” featuring Dave Steezy. It booms out the speakers with his quintessential hyphy-indebted sound, but even better, flips a Stevie Wonder sample into a true West Coast anthem.