Johann Kuhnau Magnificat in C major with insertion movements for performances over Christmas – Breitkopf Urtext edited by David Erler. Kuhnau’s Magnificat in C major is – apart from his Biblical Sonatas – considered to be his most ambitious and best known work. However, as recent research has revealed, there are indeed many other large-scale works among his oeuvre which are largely presumed lost today, apart from those that were published as first editions.