Incommoding Slides into Major Keys in Mixolydian and Lydian Modes: Strategies for Maintaining Modal Integrity

When composing music in Mixolydian or Lydian mode, it is crucial to understand how to prevent the piece from inadvertently slipping into the subdominant or dominant major keys. This article explores the elements that define these modes and offers strategies to maintain their unique modal qualities.

Understanding Modal Attributes

Modal music is distinguished by a single tonic—the i or I chord in the mode. In modal composition, the focus should be on the attributes that define the mode, ensuring it retains its distinct sound. Distractions from these defining elements can lead to a piece that inadvertently slides into a different key, such as A Major or G Major, which are the subdominant and dominant in the key of D, respectively.

Key Considerations for Mixolydian Mode

In G Mixolydian, the tonic is V or V7, such as G or G7. Common cadence chords for this mode are those that include the b7 of the scale, such as iiim7b5, VII, VII7, and bVIImaj7. While chords like the m7b5 and dom7 are used, they are less common in modal music as they often sound more tonal. An example of commonly utilized chord progressions in G Mixolydian is:

Cadence Chords:

Dm Dm7 as cadence chords containing F, the characteristic note in G Mixolydian. F Fmaj7 as cadence chords containing F, the characteristic note in G Mixolydian.

Approach Chords:

A minor 7 (Am7) and E minor 7 (Em7), which act as approach chords to the cadence chords. C major 7 (Cmaj7), which can be used as a cadence or approach chord, but should be used with caution due to its tonal tendencies, especially on strong beats.

Strategies for Maintaining Modal Integrity

Several strategies can help maintain modal integrity:

1. Focus on the Tonic Triad

Ensure the tonic triad is prominently featured in the melody. For G Mixolydian, the tonic triad is G (G-B-D).

2. Utilize Modal Cadences

Modal cadences often use the 7 or b7 5 and 2 or b2 notes in the melody. Examples of these cadences are:

2-1 b7-1 2-b7-1 b7-2-1 5-1

3. Incorporate Characteristic Notes

In G Mixolydian, the b7 (F) is a key characteristic. Use this note frequently in the melody to maintain the flavor of the mode. Similarly, in G Lydian, the #4 (F#) is a key characteristic, and its use will help maintain the unique sound of that mode.

Example Progression in G Mixolydian

A possible progression might look like this:

Chords like G7 G7 G7 G7, with a possible transition into Dm7 Dm7 Followed by G7 G7 G7 G7 Fmaj7 Fmaj7 Cmaj7 Cmaj7

This progression will maintain the G Mixolydian vibe and avoid sliding into the dominant or subdominant major keys.

Conclusion

By focusing on the tonic and utilizing specific cadences and approach chords, you can effectively maintain the modal integrity of your music. While some chords may have tonal tendencies, a strong melodic foundation rooted in the character of the mode is key. Experiment with different progressions and cadences to find what works best for your piece, and enjoy the rich, nuanced sounds of modal music.