The first interval wall also happens to be the first mode. An interval wall, is just examining all the intervals if we barred an area of frets that contain an octave. The Ionian Interval Wall contains the following intevals: 1, 4, b7, b3, 5, 1. Lydian (4), and Mixolydian (5) will be common in interval walls, because 4s and 5s precede 1s in the circle of 4ths/5ths. Because the B string is tuned a half step lower, instead of the 5 being a b6, it is instead a 5, and subsequently the 1 instead of being a b2 is thus a 1. Interval walls is an interesting concept that helps the user better examine what is the interval concept and how it is laid out across the fret board in standard tuning—thus it helps the user better understand the effects of the B string’s tuning in standard tuning.
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