Task: Text Categorization
Input (English): Each one of these pieces features a violone or violone grosso which essentially mirrors the cello, and the tuning of said instruments for these pieces is debated. One of these requires the use of an Echo flute, and only the first one of them has four movements, the last of which contains a polonaise and is notable for featuring hunting horns. A slow harpsichord movement is inserted into the third one of these, and its final piece features a viola de gamba which was to be played by Prince Leopold. For 10 points, identify this collection of six instrumental pieces by J. S. Bach named after a German duchy.
Output (English): Fine Arts