A drawbar on a Hammond organ is a component used to shape the sound of the instrument. Each drawbar controls the volume of a specific set of harmonics or overtones, effectively functioning like a graphic equalizer. The organist can pull out or push in these drawbars to various degrees to mix different harmonic combinations, thus creating a wide range of unique sounds. The position of the drawbars determines the timbre or tone quality of the notes played. This flexibility in sound shaping is one of the distinctive features of the Hammond organ, contributing to its popularity in various music genres, particularly in jazz, blues, and rock.