English: Voice 4: A single bar from "Fugue No.17 in A flat", BWV 862, displaying contrapuntal polyphony. The piece is part of J. S. Bach's Das wohltemperirte Clavier, Part I.
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{{Information |Description ={{en|1=Voice 4: A single bar from "Fugue No.17 in A flat", BWV 862, displaying contrapuntal polyphony. The piece is part of J. S. Bach's ''Das wohltemperirte Clavier'', Part I.}} |Source ={{own}} |Author =...