As a genre, pop music is extremely eclectic, often borrowing elements from other styles including urban, dance, rock, Latin and country; nonetheless, there are core elements which define pop. Such include generally short to medium-length songs, written in a basic format (often the verse-chorus structure), as well as the common employment of repeated choruses, melodic tunes, and hooks.
So-called “pure pop” music, such as power pop, which has been described as mixture of hard rock and melodic pop music and tends to be more aggressive than pop rock, features all these elements, using electric guitars, drums and bass for instrumentation.
David Hatch and Stephen Millward define pop music as “a body of music which is distinguishable from popular, jazz, and folk musics”. According to Pete Seeger, pop music is “professional music which draws upon both folk music and fine arts music”. Although pop music is often seen as oriented towards the singles charts it is not the sum of all chart music, which has always contained songs from a variety of sources, including classical, jazz, rock, and novelty songs, while pop music as a genre is usually seen as existing and developing separately. Thus “pop music” may be used to describe a distinct genre, aimed at a youth market, often characterized as a softer alternative to rock and roll.