👉 In music, a subtone is a lower pitch in a musical scale that is often used in jazz and popular music. These are pitches that are not commonly heard or played on the piano. They can be found in the keys of C, D, E, F, G, A, B (or sometimes Bb) and sometimes in the keys of G, A, Bb, C, D, E, F, Gb, etc. For example, the subtone in C