Modes

This is a 1.2 minute video response from Nick Greathouse on Nov 1st, 2008

Question:

"john873 asks, "Lets say we are improvising in the key of G Dorian, I want to begin moving down the fretboard to get some higher notes. When i move up to the A Phrygian position do i continue to use G as my root note; or instead, do i switch to A?""