Even though R. Kelly is plotting to deliver "Kellz music" (you know, TP-2.com, 12 Play kind of music) with his next release, Black Panties (due Dec. 10), he has no trouble getting in on what's been on the pop air waves as of late. He's recently dropped collabs with Lady Gaga, Bruno Mars, and, for his latest twist, Justin Bieber.
But we shouldn't be that surprised. Odd couples are the norm, challenging the way we receive music across genres and generations. Check out these other unexpected collaborations.