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Cycles Of Tritones (aka Clash Of The Tritones)
There are only six different tritone pairs to remember. This interval is very important in any music style. It represents tension found in dominant and diminished chords, and is the most common substitution intervals. The tritone lies three whole tones (6 frets) above or below its root- C-F# F#-C. The substitution principal is V traded for a bII chord.

