Rock music began in the United States in 1950’s, but it has influenced and in turn been shaped by a broad field of cultures and musical traditions, including gospel music, the blues, country-and-western music, classical music, folk music, electronic music, and the popular music of Asia, Africa, and Latin America. In addition to its use as a broad designation, the term rock music commonly refers to music styles after 1959 predominantly influenced by white musicians.
There is basic agreement that rock is a form of music with a strong beat, but it is difficult to be much more explicit. The Collins Cobuild English Dictionary, based on a vast database of British usage, suggests that rock is a kind of music with simple tunes and a very strong beat that is played and sung, usually loudly, by a small group of people with electric guitars and drums, but there are so many exceptions to this description that it is practically useless.
Other major rock-music styles include rock and roll, the first genre of the music; and rhythm-and-blues music (R&B), influenced mainly by black American musicians. Each of these major genres encompasses a variety of substyles, such as heavy metal, punk, alternative, and grunge. While innovations in rock music have often occurred in regional centers such as New York City; Kingston, Jamaica; and Liverpool, England, the influence of rock music is now felt worldwide.
