The Harmonic Minor Scale is is similar to the natural minor scale but has a raised 7th scale degree causing an augmented second (3 semitones) between the 6th and 7th scale degrees. The organization of whole tones and semitones in an ascending harmonic minor scale are in the following order:
Tone, semitone, tone, tone, semitone, 3 semitones, semitone.
Then the order is in reverse for the descending scale.
Listen to this harmonic minor scale and then repeat the recording to sing along. Notice where the tones and semitones fall.
T = Tone (Whole Tone)
ST = Semitone
3ST = 3 semitones/augmented 2nd