Example of leading-tone triad (viio) and secondary leading-tone triad in Johann Sebastian Bach's Chorale: Gott der Vater wohn' uns bei (BWV 317). Identified by Forte (1979) ISBN 0-03-020756-8 as BWV 748, which is currently attributed to Johann Gottfried Walther.
*Augmented 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.