Within music, a leading tone is the lowered seventh degree of the scale, as opposed to the leading tone. For instance, in the The minor scale (white keys inside a piano), a leading tone is the note G (in C this would exist as Bb); & the leading tone chord uses the notes G, B, & D (inside C: BbDF). Inside music theory, a leading tone chord is symbolized by having the Roman numeral bVII whenever major even or bvii if tike.

"Subtonic" as well refers to the relationship of musical keys. E.g., proportional to a key of Scale of c major, the key of Bb major is the leading tone. Modulation (changes of key) to a leading tone come comparatively uncommon, likened by having, say, modulation into the dominant.