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https://imslp.org/wiki/Madame_Rochette%27s_Tune_Book_for_Pardessus_de_Viole_(Various) The owner of the manuscript was Mademoiselle Rochette, not Madame Rochette. See the fifth image in the file and the article by Richard Sutcliffe in Journal of the Viola da Gamba Society, vol. 2 (2009), p. 1, https:...

Regarding the "Unknown Sonata" on this page. This indeed is not Sonata no. 5 of L'Echo du Danube. However, it is Sonata no. 5 in the manuscript source cited from the Österreichischen National Bibliothek. The same manuscript also has as its Sonata no. 4 a sonata in A minor that corresponds ...