| Half diminished scale | |
| First Pitch: | C |
| Second Pitch: | D |
| Third Pitch: | E |
| Fourth Pitch: | F |
| Fifth Pitch: | G |
| Sixth Pitch: | A |
| Seventh Pitch: | B |
| Pitch Classes: | 7 |
| Modes: | I, II, III, IV, V, VI, VII |
| Forte Number: | 7-34 |
| Complement: | 5-34 |
The half diminished scale is a seven-note musical scale. It is more commonly known as the Locrian 2 scale[1] or the Aeolian 5 scale, names that avoid confusion with the diminished scale and the half-diminished seventh chord (minor seventh, diminished fifth). It is the sixth mode of the ascending melodic minor scale.
In the key of B, the half-diminished scale built on C is associated with Cm75, which functions as a ii7 chord in minor (see chord-scale system).