Let me see if I get this straight:
If I hear an E minor jam going down at Tubby's Bar and Grill and I want to noodle, I get to pick from E F# G A B C and D.
But only if the local noodling mandate has allowed an FDA-approved version of the Major Minor Sharp Everything Flat Everything Pentatonic Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Faucian and Locrian relative minor enharmonic scales????
Why can't I just play a single G note the entire time???