When you look at it Cm7 F7 interpreted as a member of Eb Lydian scale or some more dissonant variant like Lydian augmented or Lydian diminished encourages you to use the essential guide tones of the chord. If I play an Eb centred line encompassing the fifth (Bb#) the flat 5 (A) and the root itself, I've basically covered the essential chord tones staying clear of the roots and fifth which is the bass player's territory anyway.
Alan
OK, there must be something very basic I am not getting:
Eb Lydian: Eb,F, G, A, Bb, C, D, Eb
Cm7 ? Which one? There are all the modal minors and there are the harmonic and melodic, at least. Are we talking 'natural minor' maybe dorian?
F7. I presume you mean F7 dominant based on myxolydian? F G A Bb C D Eb F.
'as a member of the Eb Lydian scale'. Doesn't compute here, F dominant 7 chord is a V7 of Bb
Ionian.
If you were to build a 'pseudo' II V I on the Lydian chord, the II of the Lydian would be Dominant, and the 'V' would be Ionian. You can sub a Lydian for a I chord of course, but I don't think that's what is being said.
As I say I think I am missing something basic here...
Great thread for me, great posters
Z