*Augmented octave and diminished unison on C = C♯. Equal-tempered: 21/12:1 = 100 cents. MIDI pitch bend: none Note how the diminished unison is essentially equivalent to the augmented unison.
Bridge chord, named after en:Frank Bridge. Major chord with a minor chord a semitone above. Chord pictured followed by arpeggio with Db minor at the octave.