Here's an article by Elaine Fitz Gibbon titled Beethoven Returns to Bonn: Origins, Belonging and Misuse in Mauricio Kagel's Ludwig van (1969).
Beethoven_Returns_to_Bonn_Origins_Belong.pdf
And here's the film:
Beethoven_Returns_to_Bonn_Origins_Belong.pdf
And here's the film:

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