'It's about breaking the barriers of music,' up-and-coming rapper says of unlikely features.By James Montgomery, with reporting by Tim Kash Wale Photo: MTV News Up-and-coming MC Wale can already lay claim to the title of Washington, D.C.'s finest (either him or Ben's Chili Bowl). Now, he's looking to grab the title of D.C.'s busiest too. He's already bagged cameos from Mark Ronson, Kanye West and Lily Allen (to name just a few) for his yet-untitled major-label debut, and when MTV News managed to pin him down for a few minutes on the set of his new video — for the song "Chillin'," which features Lady Gaga on the hook — he spoke about another collaboration that already has the blogs buzzing: a pair of songs he recorded with critically adored Brooklyn rock/ soul/ space-funk outfit TV on the Radio. "I can't tell you all [the details].