Rock music is a broad genre of popular music that originated as "rock and roll" in the United States in the late 1940s and early 1950s, and developed into a range of different styles in the mid-1960s and later, particularly in the United States and the United Kingdom. It has its roots in 1940s and 1950s rock and roll, a style which drew heavily from the genres of blues, rhythm and blues, and from country music. Rock music also drew strongly from a number of other genres such as electric blues and folk, and incorporated influences from jazz, classical and other musical styles. Musically, rock has centered on the electric guitar, usually as part of a rock group with electric bass, drums, and one or more singers. Usually, rock is song-based music with a 4/4 time signature using a verse–chorus form, but the genre has become extremely diverse. Like pop music, lyrics often stress romantic love but also address a wide variety of other themes that are frequently social or political.

A rock festival is a large-scale rock music concert, featuring multiple acts performing an often diverse genre of rock music including heavy metal, hard rock, punk rock and related genres. As originally conceived in the mid to late 1960s, rock festivals were held outdoors, often in open rural areas or open-air sports arenas, fairgrounds and parks, typically lasted two or more days, featured long rosters of musical performers, and attracted very large crowds, sometimes numbering several hundred thousand people

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