Melodic major
The melodic major scale is spelled (relative to the major scale):
Notes: 1 2 3 4 5 ♭6 ♭7
Chords: I iio iiio iv v ♭VI+ ♭VII
If C is our tonic then the notes and chords in this scale are:
It is so named because it is a mirror of the (ascending) melodic minor scale. In the melodic minor scale the 6th and 7th degrees of the diatonic aeolian mode are sharpened, in the melodic major scale the 6th and 7th degrees of the diatonic major scale are flattened.