Suomeksi | In English

Modal interchange symbols

When discussing modal interchange and chords, the word "mixture" is used to denote the fact that the music in question includes degrees from both a major and a minor key. It is commonplace to hear, for example, a lowered sixth degree of a major key in the II and IV degree triads.

Scale degree symbols are based on figured bass; all intervals are counted from the bass line. A chromatic sign is sufficient to indicate a change of a third (bars 1-3 and 11). Other chromatic alterations are written after the interval number. If necessary, all intervals can be written out (bar 5).

A chromatic alteration in the bottom note of a chord is written under the chord symbol or indicated by the symbol 1 (bars 6-7).

The chromatic sign is written before the symbol when the scale degree is lowered (bars 9-10, 12, and 16). The Neapolitan sixth has a standard symbol N6. A major third (Picardy third) is a common alteration in minor keys, for example in the final chord of a composition (bar 13).