Blink-182 rocker Travis Barker is grieving the death of his close friend and music collaborator Adam Goldstein - known in the industry as DJ AM - and expressed his pain online and in concert on Saturday. The rock drummer and Goldstein escaped a plane crash together in 2008, and Barker wrote to his fellow survivor on Twitter, "Rest In Peace my brother, this really f---s me up. I'll never forget everything we've been thru and every time i play the drums i'll think of you. U were an amazing friend/DJ/human being."