A hook is a
One definition of a hook is "a musical or lyrical phrase that stands out and is easily remembered". Definitions typically include some of the following: that a hook is repetitive, attention-grabbing, memorable, easy to dance to, and has commercial potential and lyrics. A hook has been defined as a "part of a song, sometimes the title or key lyric line, that keeps recurring". Alternatively, the term has been defined as
the foundation of commercial songwriting, particularly hit-single writing", which varies in length from the repetition of "one note or a series of notes...[to] a lyric phrase, full lines, or an entire verse. The hook is 'what you're selling'. Though a hook can be something as insubstantial as a 'sound' (such as da doo ron ron), "ideally should contain one or more of the following: (a) a driving, danceable rhythm; (b) a melody that stays in people's minds; (c) a lyric that furthers the dramatic action, or defines a person or place.
While some melodic hooks include skips of an