Earworm, a calque of the German Ohrwurm, is a term for a portion of a song or other musical material that becomes "stuck" in a person's "hea" or repeats against one's will within one's mind. Use of the English translation was popularized by James Kellaris and Daniel Levitin. Kellaris' studies demonstrated that different people have varying susceptibilities to earworms, but that almost everybody has been afflicted with one at some time or another . A more scientific term for phenomenon, involuntary musical imagery, was suggested by the neurologist Oliver Sacks in 2007.