File:Hupfeld piano played (2018-10-04 @pxhere 1546039).jpg
![File:Hupfeld piano played (2018-10-04 @pxhere 1546039).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Hupfeld_piano_played_%282018-10-04_%40pxhere_1546039%29.jpg/800px-Hupfeld_piano_played_%282018-10-04_%40pxhere_1546039%29.jpg?20220428153106)
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