The power of repetition in human music is fractal, appearing at every level. Repetition of rhythm is necessary to build a musical hook. The repetition of hooks is necessary for choruses. Choruses repeat several times in each song, and people often honor their favorite songs by putting them on repeat. As every parent can attest, children love hearing the same songs again and again. But grown-ups aren’t so different. Ninety percent of the time people listen to music, they are listening to a song they’ve already heard.
