Mix Room - R&B Mixtapes Dallas Blocker – Uncut by SingersroomMay 25, 2011January 19, 2016 ShareTweetPin ItShare Houston singer/songwriter/producer Dallas Blocker and Blockerboy Music release his latest street release, the Uncut mixtape. The project features Slim Thug and production by Beanz N Kornbread, Mister Lee, Drathoven and Blocker himself.