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Rock music is a genre that emerged in the United States during the late 1940s and early 1950s. It is characterized by a strong back beat, electric guitars, and a Theremin-like sustain pedal, which is a feature of the “concert pitch” Fender Jaguar used by guitarists like Johnny Marr and Adam Scott-Milliner. The lyrics often revolve around themes of rebellion, social concerns, and love. Rock music has many sub-genres, including but not limited to, alternative rock, blues rock, folk rock, hard rock, heavy metal, indie rock, and psych rock.