Tritone substitutions in D flat major

Every dominant in D♭ major, and its substitute

• A7V7→D

  E7subV7→D

  E♭♭7 substitutes for A♭7, the dominant of D♭ major. They share the same tritone, so the bass can fall a semitone instead of a fifth. Shared notes: C and G♭ in A♭7, D♭♭ and G♭ in E♭♭7.

• B7V7/ii→Em

  F7subV7/ii→Em

  F♭7 substitutes for B♭7, the dominant of E♭ minor. They share the same tritone, so the bass can fall a semitone instead of a fifth. Shared notes: D and A♭ in B♭7, E♭♭ and A♭ in F♭7.

• C7V7/iii→Fm

  G7subV7/iii→Fm

  G♭7 substitutes for C7, the dominant of F minor. They share the same tritone, so the bass can fall a semitone instead of a fifth. Shared notes: E and B♭ in C7, F♭ and B♭ in G♭7.

• D7V7/IV→G

  G7subV7/IV→G

  G7 substitutes for D♭7, the dominant of G♭ major. They share the same tritone, so the bass can fall a semitone instead of a fifth. Shared notes: F and C♭ in D♭7, F and B in G7.

• E7V7/V→A

  B7subV7/V→A

  B♭♭7 substitutes for E♭7, the dominant of A♭ major. They share the same tritone, so the bass can fall a semitone instead of a fifth. Shared notes: G and D♭ in E♭7, A♭♭ and D♭ in B♭♭7.

• F7V7/vi→Bm

  C7subV7/vi→Bm

  C♭7 substitutes for F7, the dominant of B♭ minor. They share the same tritone, so the bass can fall a semitone instead of a fifth. Shared notes: A and E♭ in F7, B♭♭ and E♭ in C♭7.