New music from Dr. Dre (even though he's not on it) titled Topless featuring T.I. and Nas, If you listen to the T.I.'s verse that's actually Dr. Dre's verse the same way Eminem originally did Dre's verse on the Pop a Bottle joint before they actually dropped the real version, not sure why there doing that.
Download:Dr. Dre feat. T.I. & Nas – Topless