Sonic Logo: A very short audio composition that expresses something essential about the organization, product, or service that it is meant to represent. The aural equivalent of a graphic logo, a sonic logo (also called a “sound mark,” “audio logo,” “sonic signature,” or “ear worm”) typically comprises a unique melody, some kind of sound effect, and perhaps a human voice—all of which are intended to evoke the company, product or service in a memorable and emotionally compelling way.