As there are many definitions for music there are many divisions and groupings of music, many of which are as hotly contested as, and even caught up in, the argument over the definition of music. There are many musical genres. Among the larger genres are classical music, popular music or commercial music (including rock and roll) and folk music. The term world music is applied to a wide range of music made outside of Europe and European influence, although its initial application, in the context of the World Music Program at Wesleyan University, was as a term including all possible musics, and not excluding European traditions. In academic circles, the original term for the study of world music, "comparative musicology", was replaced in the middle of the twentieth century by "ethnomusicology", which is still an unsatisfactory definition. The term video game music refers to music pieces from a video game.
Genres of music are as often determined by tradition and presentation as by the actual music. While most classical music is acoustical in nature, and meant to be performed by individuals, many works include samples, tape, or are mechanical, and yet described as "classical". Some works, for example Gershwin's Rhapsody in Blue, are claimed by both Jazz and Classical Music.
As cultures of the world have been in more contact with each other, their indigenous music styles have often melded to form new styles. For example, the U.S.-American bluegrass style has elements from Anglo-Irish, Scottish, Irish, German and some African-American instrumental and vocal traditions, and can only have been a product of the 20th Century.
Many music festivals exist these days celebrating a particular music genre.
See: List of genres of music
Music and math
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