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The Sorrowful progression (i7-iv7-bVII-i7) in C minor uses 4 chords: C minor 7 (i7), F minor 7 (iv7), Bb major (bVII), C minor 7 (i7).
Genre: Jazz ballad
Moving minor-7th chords give a weighty, jazz-ballad sorrow, the bVII acts as a modal dominant before sinking back home.