Walk This Way was originally released by Aerosmith in 1975, and Run-DMC reworked it in 1986 with Steven Tyler and Joe Perry appearing on the track. That version became a landmark rock and hip-hop crossover, bringing rap to a wider rock audience and reviving Aerosmith's career. The opening guitar riff has since become one of the most recognisable intros in popular music, sampled and quoted in countless edits, commercials and videos. Short clips work especially well online because listeners identify the song instantly from just a few notes.