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February 28

Chord accompaniments for certain melodies

Listen to the video at:

https://www.youtube.com/watch?v=848K8n7l2sE

The melody they are playing is mostly in the key of A major, but there is one note that (very briefly) takes the song out of the key. It is F. If it were an F♯, it would be easy to see what chord progression accompanies this melody. The chords would be A-D-E7-A. But the F natural means the short melody briefly modulates from A major to C major (and then back to A major briefly after.) The best chord progression here is A-G7-E7-A. Does this make sense?? (If not, please reveal the best chord progression for this melody.) Georgia guy (talk) 14:56, 28 February 2024 (UTC)[reply]

The fragment has been transposed from Bach's C minor to D minor. Strangely, the piece opens in C minor but ends on the G major chord – after transposition the A major chord, A–C♯-E. This can also be analyzed as being in the scale of A minor, but with a Picardy third; it is ambiguous. This YouTube video offers a harmonic analysis of the piece; the last beat of measure 42 is analyzed as vii⁷, the diminished seventh chord on, after transposition, G♯. --Lambiam 14:01, 29 February 2024 (UTC)[reply]