I remember hearing Casals in Brussels in a ’cello concerto by the Dutch composer Julius Röntgen, lavishing upon it the witchery of what is probably the greatest art among all string players. For – though Casals did give to the world “definitive” performances of the Bach solo sonatas and of most of the ’cello classics (as “definitive” as anything can be in recreated music) – it did not prevent him from devoting himself to the Röntgens and the Emmanuel Moors. He often played Moor’s ’Cello Concerto, as well as the Violin and ’Cello Double Concerto, with no less a fellow propagandist of Moor’s than Eugène Ysaÿe!