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 and can be something as insubstantial as a 'sound' (such as
da doo ron ron or
toora-loora-loo) but While some melodic hooks include skips of an
octave or more to make the line more interesting, a hook can be equally catchy by employing rhythmic
syncopation or other devices. A hook may also garner attention from listeners from other factors, such as the vocal timbre or instrumentation, as in the case of the
Beach Boys' use of an
Electro-Theremin in "
Good Vibrations". Some hooks become popular without using any unusual elements. For example, in the song "
Be My Baby", performed by female group
The Ronettes, the hook consists of the words "be my baby" over the conventional
I–vi–IV–V chord progression of the
chorus. Hooks in hip-hop almost always refer to the chorus between verses; as in the lyrics to Vanilla Ice's "
Ice Ice Baby", "check out the hook, while my DJ revolves it", that leads into the chorus itself. ==Use in market research==