“Striving for the highest in art" – this is how Schubert announced his A-flat major Mass to the Schott publishing house in 1828. The statement can also be seen as an artistic credo applicable to his last great mass, which the composer wrote that same year but whose first performance in October 1829 he no longer lived to experience. Since a source-critical new edition of the E-flat major Mass is a must for Breitkopf & Härtel's catalogue, Peter Jost has taken up this challenge and come up with a compelling edition that does justice to the high demands of the “Breitkopf Urtext" collection.