Rock music is a broad popular music that started as rock and roll in the USA during the 50's and became more evolved during the 60's.
Yes that is very true
With regards musically rock has centered on the electric guitar , mostly as part of a rock group with a electric bass , drums and sometimes other players as well.
Sounds like you have done your research. When I think about all the different rock songs I enjoy listening to, it always revolves around the guitar
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 usually 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.
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- Rock music – a broad offshoot of rock and roll that is typically characterized by a basic backbeat, 4/4 riffs, and is musically centered on the (usually electric) guitar, bass guitar, drums and vocals, although there are numerous styles within rock where this characterization does not apply.
- Rock opera – a collection of rock music songs with lyrics that relate to a common story.
- Rock and roll – a popular music genre that combines rhythm and blues (as in the blues style) and