Popular music belongs to any of a number of musical genres, and stands in contrast to art music, and traditional music which was disseminated orally. Although popular music sometimes is known as "pop music", the term pop music usually refers to a specific musical genre. Popular music dates at least as far back as the mid 19th century, and is commonly subdivided into genres. Different genres often appeal to different age groups. These often, but not always, are the people who were young when the music was new. Thus, for instance, Big band music continues to have a following, but it is probably a rather older group, on average, than the audience for rap. For some genres, such as ragtime music, the original target generation may have died out almost entirely.

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