The harmonic minor scale

The harmonic minor scale has just one tonally effective mode and that is the scale conventionally known as the harmonic minor scale. It is spelled, in numerical form (relative to the major scale):
1         2         flat3         4         5         flat6         7         Notes
                                                              
i         ii0         flatIII+         iv         V         flatVI         vii0         Chords

If the tonic is c, the notes and chords are:
c         d         eflat         f         g         aflat         b         Hear these notes
                                                              
c         d0         Eflat+         f         G         Aflat         b0         Hear these chords

The harmonic minor scale is well known to common practice classical music because it is the harmonic foundation of minor mode music. It is, however, avoided as the melodic foundation because of the "unmelodic" augmented second found between its sixth and seventh degrees.