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{{Infobox Chord|20:25:30:36}} | {{Infobox Chord|20:25:30:36}} | ||
'''20:25:30:36''', a ''major-minor seventh chord'', is a [[tetrad]] in [[5-limit]] harmony, sometimes considered a form of [[dominant seventh chord]]. It combines a [[5/4]] major third with the [[consonant]] [[9/5]] seventh that would be found in a [[Ptolemaic minor seventh chord]] on the same root, creating a [[36/25]] tritone between the two. | '''20:25:30:36''', a ''major-minor seventh chord'', is a [[tetrad]] in [[5-limit]] harmony, and sometimes considered a form of [[dominant seventh chord]]. It combines a [[5/4]] major third with the [[consonant]] [[9/5]] seventh that would be found in a [[Ptolemaic minor seventh chord]] on the same root, creating a [[36/25]] tritone between the two. | ||
The major-minor seventh chord is found rooted at the I ({{Frac|1|1}}) and IV ({{Frac|4|3}}) of the [[duodene]]. | The major-minor seventh chord is found rooted at the I ({{Frac|1|1}}) and IV ({{Frac|4|3}}) of the [[duodene]]. | ||