In the second half of the 1970s, punk rock reacted against the perceived overblown, inauthentic and overly mainstream aspects of these genres to produce a stripped-down, energetic form of music valuing raw expression and often lyrically characterised by social and political critiques. New genres that emerged from this scene included progressive rock, which extended the artistic elements glam rock, which highlighted showmanship and visual style and the diverse and enduring subgenre of heavy metal, which emphasized volume, power, and speed. Rock places a higher degree of emphasis on musicianship, live performance, and an ideology of authenticity than pop music.Д«y the late 1960s, referred to as the вЂњgolden ageвЂќ or вЂњclassic rockвЂќ period, a number of distinct rock music subgenres had emerged, including hybrids like blues rock, folk rock, country rock, raga rock, and jazz-rock, many of which contributed to the development of psychedelic rock, which was influenced by the countercultural psychedelic scene. The dominance of rock by white, male musicians has been seen as one of the key factors shaping the themes explored in rock music. 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. Typically, rock is song-based music usually with a 4/4 time signature using a verse-chorus form, but the genre has become extremely diverse. Musically, rock has centered on the electric guitar, usually as part of a rock group with electric bass guitar and drums. Rock music also drew strongly on a number of other genres such as electric blues and folk, and incorporated influences from jazz, classical and other musical sources. It has its roots in 1940sвЂ™ and 1950sвЂ™ rock and roll, itself heavily influenced by blues, rhythm and blues and country music. Rock music is a genre of popular music that originated as вЂњ rock and rollвЂќ in the United States in the 1950s, and developed into a range of different styles in the 1960s and later, particularly in the United Kingdom and the United States.

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