Answer: The I–V–vi–IV progression is a common chord progression popular across several genres of music. It involves the I, V, vi, and IV chords; for example, in the key of C major, this would be: C–G–Am–F.
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Answer:
Upper-case numerals represent major triads. Lower-case numerals represent minor triads. Upper-case numerals with a small plus sign represent augmented triads. Lower-case numerals with a small circle represent diminished triads.
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