Assertion: chord | /r/CapableOf | explain the rarity of the chord
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Source sentences:
text: The chord, infrequent in rock and popular music, is "virtually always found on the fourth scale degree in the major mode", thus making the seventh of the chord the third of the scale and perhaps explaining the rarity of the chord, given the "propensity of the third scale degree to be lowered as a blues alteration.