A mode is a scale in which the tonal center has been displaced. It is simply playing a major scale in any given key and beginning and ending on the same note an octave apart which is not necessarily the root of the key. To comprehend then implement these improvisational scales is an important lesson and the melodic basis for many great jazz artists. Scales & Modes are an important part of the playing styles of so many great guitarists that to name them all would be an impossible. Teach Yours...