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Musically, rock has centered around the electric guitar, usually as part of a rockgroup with bass guitar and drums. Typically, rock is song-based music usually with a 4/4 time signature utilizing a verse-chorus form, but the genre has become extremely diverse and common musical characteristicsare difficult to define. Like pop music, lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political in emphasis. The dominance of rockby white, male musicians has been seen as one of the key factors shaping the themes explored in rock music. Rock places a higher degree of emphasis on musicianship, live performance, and an ideology ofauthenticity than pop music.
By the late 1960s, referred to as the "golden age"[1] or "classic rock"[2] period, a number of distinct rock music sub-genres had emerged, including hybrids like bluesrock, folk rock, country rock, and jazz-rock fusion, many of which contributed to the development of psychedelic rock influenced by the counter-cultural psychedelic scene. New genres that emergedfrom this scene includedprogressive rock, which extended the artistic elements; glam rock, which highlighted showmanship and visual style; and the diverse and enduring major sub-genre of heavy metal,which emphasized volume, power and speed. In the second half of the 1970s, punk rockboth intensified and reacted against some of these trends to produce a raw, energetic form of music characterized...
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