I watched this vid a few times last night, to try to decipher the scales Rai uses.
The piece is a major 12 bar blues in G. To my ear, he's using a scale which combines all notes of major and minor blues scales for each chord. And he's not jumping in and out of the major or minor mode, he uses it as a scale in its own right. For eg on the G he's using all of:
G Bb C Db D F
+
G A Bb B D E
=
G A Bb B C Db D E F
which is essentially all notes of a G chromatic apart from Ab, Eb and F#. (b2, #5, #7)
Is this a thing? Does this scale have a name?