is a genre of popular music that originated in its modern form in the Western worldduring the 1950s and 1960s, deriving from rock and roll. The terms "popular music" and "pop music" are often used interchangeably, although the former describes all music that is popular.
The main medium of pop music is the song, often between two and a half and three and a half minutes in length, generally marked by a consistent and noticeable rhythmic element, a mainstream style and a simple traditional structure.Common variants include the verse-chorus form and the thirty-two-bar form, with a focus on melodies and catchy hooks, and a chorus that contrasts melodically, rhythmically and harmonically with the verse.The beat and the melodies tend to be simple, with limited harmonic accompaniment.The lyrics of modern pop songs typically focus on simple themes often love and romantic relationships although there are notable exceptions.