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Changes
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→Diminished Fifth Interval
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Using the denominator method of analyzing intervals, we get the following order from most harmonic to least: P5, P4, M6, M3, m3, m6, 7, M2, M7, d5. The d5 is the least harmonic, and it's quite apparent when playing the B dim chord. This means the vii chord not only has tension in the context of the tonality and its placement inside a progression, but it is also quite dissonant and tense in and of itself. Typically, we don't see diminished triads as commonly as diminished 7th or other extended chords. With the additional note(s) in the chord, the d5 interval is more diluted and the overall effect is less dissonant.
== Q & A ==