Hello, when learning scales, I always notice this type of formula in there "1,b3,4,b5,5,b7", this is from the "A Pentatonic Blues" scale, what does it stand for, I tried figuring it out, but my theory doesn't really work.
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Thank You for your help, that's what I was thinking all along, but other then major scales it didn't apply to others because they had numbers missing but now I understand, thank you
I tried applying it to the "A Pentatonic Blues" scale.

The notes on the scale show:

A C D D# E G

however, the formula for this scale is:

1,b3,4,b5,5,b7

If the formula is correct, wouldn't the scale be:

C D#/Eb F F#/Gb G A
(A being the root note)
Quote by Nitro89
I tried applying it to the "A Pentatonic Blues" scale.

The notes on the scale show:

A C D D# E G

however, the formula for this scale is:

1,b3,4,b5,5,b7

If the formula is correct, wouldn't the scale be:

C D#/Eb F F#/Gb G A
(A being the root note)

Formulas like that are always in relation to the relevant major scale, that's why you're getting confused. Remember, A "blues" is in fact A minor pentatonic plus an extra flat 5th, so you start with A major, then convert to A minor, remove the 2nd and 6th to make it pentatonic then add the extra flat 5th.

A major is

``````1  2  3   4  5  6   7
A  B  C#  D  E  F#  G#``````

applying this alteration

1 b3 4 b5 5 b7

to those intervals gives you

``````1   b3  4  b5  5   b7
A   C   D  Eb  E   G``````

which is A minor pentatonic with an added flat 5th, aka A blues.

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Last edited by steven seagull at Dec 3, 2008,