I know I already asked this question but this is different. After seeing the tab for "Flying in a Blue Dream," Satriani plays the same mode with different notes like C lydian and Ab Lydian. When you change modes, do you change the root note as mentioned above or from D Dorian to F Lydian?
u change frm D dorian to F lydian - by changing mode u change the entire 'feel' or 'mood' of the tune - by changing root/key u just transpose/shift the same 'feel' to a different pitch
by playing that note more often, letting it ring, playing it with greater 'attack', starting/ending the melody on that note etc.
As far as whatever I have experimented with this issue, I keep the root note same. Lets say some prog is being played on C major scale. Like C maj -> A min -> G major -> C major I would start by playing in C Ionian (major scale) and mebbe shift at a point of time to C Phrygian (which imparts certain spanish music touch) Cahnge to C Lydian for a "cool" "spacey" sounds (like Satch n Vai use sometimes) an dswithc back to C Ionian. Now if you question is HOW to change from C Ionian to C Lydian or C Phrygian etc ... you need to be aware of the common notes. Otherwise you can alos use the chromatics are bridging notes. However, somehow, I have not yet mastered the use of chromatics as passing notes.
@ace just to clarify tht i was talkin abt there was changing the mode while keeping the notes the same and changing root/key while keeping the mode the same when u change from D dorian to F lydian u r in fact changing both the mode as well as the key but still playing the exact same notes - just changing the emphasised note from D to F - amazing no? changing the key is called modulation & is used to create 'freshness' & 'surprise' within a song - 4 this u need to know the 'circle of fifths'
