1. The sign (♮), canceling a sharp (♯)or flat (♭). 2. A white key on the keyboard.

Natural harmonics, those produced on an open string; natural horn, one without valves; natural interval, one found between any two tones of a diatonic major scale; natural key, C major; natural pitch, that of any wind instrument when not overblown (see OVERBLOWING); natural scale, one having neither sharps nor flats, i.e., C major; natural tone, any tone obtained on a wind instrument with cupped mouthpiece, without using keys, valves, or the slide.