1. A musical passage or interjection that falls between melodic phrases. A “fill” can almost be thought of as a very brief solo that fills in the gaps between melodies in a piece of music. Fills are generally improvised, though certain styles of music rely on a selection of fairly standard fills.
2. Short for “drum fill,” which is a fill that is played on a drum kit.
3. Short for “sidefill,” which refers to stage monitors that are set to project sound across the stage, from the sides.
4. A rhythmic figure used between repeating verse, chorus, or other repeating patterns in a song on a drum machine.