Folk music is traditional music, the genre that evolved from it during the folk revival of the 20th century. Some types of popular music can be called world music. But, it has been contrasted with commercial and classical styles.
Traditional folk music has been defined in several ways, such as: music that is transmitted orally, music by unknown composers, or music performed to order over a long period of time.
The term has its origins in the 19th century, but popular music is known to extend beyond that.
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