Based on the practice of the time to vary the improvisational moments indicated by Fermatas when repeated, suggestions for implementation are included in the note text in footnotes. Karl Maguerre (editor), born in 1906; studied music and mathematics; lived in Darmstadt. Since 1947 professor at the Technical University of Darmstadt and director of the orchestra and choir at the university. Author of numerous essays on classical music and editor of the first Urtext edition of Mozart's piano trios by Peters Verlag. His famous student Gidon Kremer could be won over for the publication of the violin part for the Urtext editions planned with the participation of David Oistrach.

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