The Ionian mode is the same thing as the basic major scale. The DADGAD tuning
is very biased towards using this scale. The tuning allows this scale to be
played easily with the open-strings ringing out. Solo guitarists often use this
scale to play Celtic aires in DADGAD. It is also very convenient for more up
tempo finger picking, with hammers and pull offs onto the open strings being
common techniques.
