Hey Bar Hook...
Sorry if I'm off base, but I think what you're asking is, what Lydian scale is Kenny playing over the chords, right?
Well, the answer is he plays C Lydian over the C maj 7 chords, Eb Lydian over the Eb chords, and Gb Lydian over the Gb chords... so he switches scales depending on which chord is being played by the accompaniment. Does that answer your question?
Now, if you're confused about what a lydian scale is, I'll give you the other way of thinking about it. Lydian is a Major scale with the fourth note raised a half step (one fret).
For C major the notes would be C D E F# G A B
For Eb the notes would be Eb F G A Bb C D
For Gb the notes would be Gb Ab Bb C Db Eb F
The other way to think about this and what the other guys were saying is that:
C Lydian is also the same notes as G Major but you start on the 4th degree.
Eb is the same notes as Bb but you start on the 4th degree.
Gb is the same notes as Db but you start on the 4th degree.
Hope that clears up some issues!
p.s. Nice tune Kenny!