Popular German folk tunes such as 'Ich bin so lang nicht bei dir g'west' (a tender reunion song) and 'Kraut und Rüben haben mich vertrieben' (a humorous complaint about being served only cabbage and turnips).
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Goldberg Variations, BWV 988: Variatio 30 a 1 Clav. Quodlibet
At the grand climax of the cycle, Bach forgave the expected canon at the tenth in favor of a family quodlibet, harmonizing everyday secular melodies into a sublime four-part polyphony over the ground bass.
Transforming casual tavern ditties into monuments of high Baroque counterpoint, Bach dissolved strict mathematical rigor into communal joy before returning to the opening Aria.