The seventh mode of the Melodic Minor Scale is called the Super Locrian mode but it's better known and The Altered Scale. I have a lesson on Altered Harmony which will explain it properly - it's a big deal - check it out!

The scale formula for the Super Locrian is below, it describes the interval distances between each note of the scale. Note the 4 Tones in a row that help give this scale it's unique quality.

	S		T		S		T		T		T		T
1		2		3		4		5		6		7		8

T = Tone [whole step] • S = Semitone [half step]

Comparison With Major Scale

Scales are always compared to the Major Scale to find the intervals used.

	I	II	III	IV	V	VI	VII	I
C Major Scale	C	D	E	F	G	A	B	C
C Super Locrian	C	Db	Eb	Fb	Gb	Ab	Bb	C
Equation	1	b2	b3	b4	b5	b6	b7	1
Equation 2 (ALT)	1	b9	#9	3	b5	#5	b7	1

It's a Locrian Mode with a flat 4 - but the second Eqn above makes sense of it, it's the notes available in an altered dominant chord, laid out in a scale. Watch my lesson about Altered Harmony if you don't get it.

Chords And Extensions

Because we're thinking modally here we're looking at the individual chords you might use this scale over not the Chords In The Key of the Melodic Minor Scale.

This scale is played over Altered Dominant chords, that is 7th chords with any or all of #5, b5, #9 or b9.

7#5b9
7#5#9
7b5b9

etc.