Other Modal Interchange Chords

Other Modal Interchange ChordsWeek 6

Modal Interchange Part 2Other possible modal interchange chordsMajor interchanging to minorMajor interchanging to majorMinor interchanging to minorMinor interchanging to majorChord scale choices

Other modal interchange chordsAny chord may be borrowed from any parallel mode and used functionally in the context of the principle modality

Other times duplicate qualities on the same scale root will offer different tensionsSometimes the available chord and scale will offer an alternative cadential function

Of the 63 possible I IV functions over the 7 modes and harmonic and melodic minor, only a handful have been consistently used as modal interchange chords.

Examine pages 54 & 55 of your Harmony 4 textAll 63 possible chords are illustrated

Major interchanging to minorMajor interchanging to majorMinor interchanging to minorMinor interchanging to majorThere are 4 possible modal interchange scenarios:

Major interchanging to minor

Ionian to AeolianThe most common of the four possibilities Specifically ionian to aeolian, harmonic or melodic minorEg: You Give Me Something by James Morrison

James Morrison You Give Me Something

James Morrison You give me something.10

Popular in Brazilian folk and popular songsCommon modal interchange chords include Im7 and IV7i.e. Wave - Antonio Carlos Jobim New Real Book p. 393

Ionian to Dorian

Ionian to PhrygianPossible interchange chords include:Imaj7 bIImaj7Imaj7 bVIIm7See page 56 of your Harmony 4 text

Ionian to LocrianRare to see this kind of interchange.Some possible interchange chords are: Imaj7 bIIIm7 Imaj7 bVmaj7

See page 56 of your Harmony 4 text

ACTIVITY:Write an 8 bar progression containing either:Ionian to DorianIonian to Phyrgian Ionian to Locrian , modal interchange

Major interchanging to Major

Ionian to MixolydianCreates a blues quality without relying on the I7 and IV7 chordsPossible progressions:Imaj7 bVIImaj7Imaj7 Vm7 See:Learn to Fly Foo FightersStarlight Superman LoversFire and Rain James Taylor

Ionian to LydianPossible interchange chords include:Imaj7 VIIm7I II over Tonic PedalCreates bright chords in an ionian progression

Minor interchanging to minor

Composite minorMost minor to minor interchange occurs within composite minorNatural, harmonic, melodic and dorianAlthough all minor systems are equal, one will usually hold more weight than the othersThis insures a sense of interchange rather than ambiguity

Aeolian to PhrygianThe bIImaj7 chord is the most common phrygian structure usedbVIIm7 can be used as a substitute for bIImaj7

Aeolian to DorianIIm7 in an Aeolian context indicates a parallel dorian modal interchange

Minor interchanging to major

Tierce de PicardieMost basic use is when the Im7 is replaced with the Imaj7Typically this happened at the final cadenceIn contemporary usage, the Im can be replace by the I anywhere if the melody allowsEg. Exit Music (for a Film) Radiohead

Chord scale Choices

When a choice for a chord scale exists on a specific function, the quality of the primary modality usually dictates the type of mode from which the chord scale will be takenSee page 60 of your Harmony 4 text

I.E. pick the mode that has the most common tones with your primary modality

Modal SourceThe modal source of a particular modal interchange chord identifies the parallel modality that the chord has been taken from

The chord scale for a modal interchange chord identifies the available chord tones and tensions

The only time a modal source and chord scale will be the same is for the I chords

ACTIVITYIdentify the modal source of the chords in your 8 bar progressionWrite our the appropriate chord scales for each chordCreate a melody from the chord scales

Taste, style and creative intention will determine when to use modal interchange.

If overly used, modal interchange will create confusing ambiguity in modal center.

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