Run-D.M.C.'s best-selling 1986 rap album "Raising Hell" featured a genre-bending collaboration with Steven Tyler and Joe Perry for a cover of Aerosmith's song "Walk This Way." The result was a spot on the Billboard Top 10, the first for a hip-hop hit. This episode from the "Impact: Songs That Changed the World" series revisits the power and popularity of the breakout song. 36 min. Soundtrack: English Dolby Digital stereo.