The pattern of a melodic minor key is: tone - semitone - tone - tone - tone ... major key signature and raise the seventh note of the scale. For example, in A harmonic minor there are no sharps ...

For example, an interval of just one semitone is known as a minor second ... interval pattern T-T-S-T-T-T-S, where S is a Semitone, and T is a Tone (two semitones). The C major scale is made ...