- Borrowing notes from the parallel key
- More common in major keys
- Changes chord quality but not function
- Can apply to melodies, one or more chords, extended tonicizations and modulations
- Chords with lowered roots use a in front of the Roman numeral (e.g., )
Modal mixture (or borrowing) is the harmonic technique of mixing the notes from the parallel major and natural-minor modes (e.g., C major and C minor). This results in changing the chord qualities and/or melodic “color” to achieve expressive effects not available in the main scale itself. In the majority of cases, this occurs in major-key pieces where notes from the parallel minor are borrowed. Most of this chapter reflects that norm. The next two examples are a brief review of parallel minor scales and their associated solfege and scale degrees. Notice the three differences between the scales: mi/me (/), la/le ( /), and ti/te (/).
Melody and Harmony
While these changes may only be reflected in a single melodic line to add color to a specific moment, quite often they have a pronounced harmonic effect. By borrowing notes from the parallel scale, the chord qualities change as shown below in the next two examples:
Chords with le () only
As you might expect not all of these modal mixture possibilities show up with equal frequency. Cadential predominant chords are common targets and the examples below appear with some frequency in cadential progressions, each of which only borrow le () from the parallel minor key.
Altering Chord Roots
Borrowing me () and te () are also common. Notice that when the root of the chord is changed from its original position in the scale, an accidental is placed in front of the Roman numeral to signifiy this change. These accidentals are not to read literally as flat or sharp, however. They are used to mean lower () and raise () instead. So, the Roman numeral means a major triad built on the lowered 3rd scale degree.
Tonic and Dominant
Using modal mixture with tonic and dominant chords is also possible. Changing from to is a common technique but to is not as common and may instead be the indictation of an extended tonicization or modulatory passage instead of a single instance of modal mixture.
Using Modal Mixture
Using modal mixture is as simple as lowering a few notes but it is most common for chords to be fully borrowed from the minor scale not just partially. For example, only using le () when a chord also uses mi () is uncommon. Is it also common that once modal mixture enters, it stays until the harmony moves on to another harmonic category. So, if there are two predominant chords and the first one uses modal mixture, the second chord is very likely to include it as well. The modal mixture is likely to stop once the predominant area has moved on to the dominant harmonic category, but not always.
The one common situation where modal mixture occurs in minor keys is called a picardy third. It involves ending a major key piece or movement with a major tonic chord. According Oxford Music Online, it is unknown where the name picardy comes from, but the technique was quite common in the 16th and 17th centuries but faded in popularity in the later 18th and 19th centuries.
Large-Scale Modal Mixture
While modal mixture may only involve a brief melodic change or involve one or more chords, it is also used in extended tonicizations and can be used to facilitate a modulation to a distantly related key. The example below shows a modulation between two distantly related keys (B major and D major) using a chromatic pivot chord to smooth out what could be a rather abrupt modulation. The subdominant chord uses le ()instead of the diatonic la () which makes the chord sound like in the first key by in the second key.
Example 11 shows a simple harmonic progression that borrows from the parallel minor key which produces modal mixture. Notice the change in quality from to .
Example 12 is a more extensive usage of modal mixture. Modal mixture is introduced at the third system and continues until the conclusion of the phrase at the bottom of the page. This results in a modulation from E major to its parallel minor, E minor. Notice in particular the dramatic effect of starting a phrase in a major key and ending in a minor key with same tonic.
Modal Mixture Assignment
- Includes spelling, figured bass realization, 4-part voice-leading with Roman numerals, and analysis of musical excerpt.