the hindustan scale has a flattened 6th and 7th in relation to the standard western major scale.
in western music its very limited in its use with our system , due to the fact that you have to transpose your musical knowledge of theory to it , which ultimately changes all the voicings of the chords .
for example , you couldnt play this scale using regular chords .
ie : in C major you have Cmaj Dmin Emin Fmaj Gmaj Amin , Bdim
the C hinustan scale has a b6 and b7 making it C D E F G Ab Bb C
so if you were to play an Fmaj chord , the scales b6 would clash with the Fmajor's mediant note(3rd) which is A- you would have to change Fmaj to Fmin
this applies to all of the chords containing the notes A and B , in the C scale.
however , if you start the scale on the note of F and play F G Ab Bb C D E F which would be the hindustani version of our lydian mode , then the scale begins to make more sense to our western minds - its an F melodic minor scale .
so basically Kirk hammett was playing a melodic minor scale based upon the 'cycle of fourths' theory .
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