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on concepts in composition

3 types of substitution: tritone, minor 3rd, major 3rd

elements of substitution:

• comon tones
• enharmonic equavilent
• symmetry
• functional subs (act like the ones they are replacing)-tonic/sub dom/dom function
• III for I, II for iV
• Bdim7 for G7

tritone

• dominant sub
• guide tones are interchangeable
• include accompanying II chord
• G7 becomes Ab-7 Db7
• strolin E-7 A7 (for Bb-7 Eb7) Ab7 Db
• works well for never another you

minor 3rd

• dominant sub
• Bb7 for G7 (d and f are retained tones)
• Db is tritone
• E7 for G7 (b and d are retained tones) weakest due to root movement
• E is sub for Bb
• II chords may go with these as well
• lady bird is a minor 3rd sub (3rd bar)
• 1st 2 chords in moments notice are minor 3rd sub
• E-7A7 is for G-7C7 (which is Vol II)
• valid melodic sub as well
• pick a shape on the II and move is up a minor 3rd on the dom

major 3rd

• tonic sub
• pentatonic?
• E maj for Cmaj (e and b are retained)
• Ab for C (g and c are retained)
• may be preceded by V

tip

• augmented scale is 2 aug triads 1/2 st apart
• or 1/2 step-min 3rd, 1/2 st-min
• (another symmetric scale)