The autograph to Beethoven’s Piano Concerto No. 4 is lost. For every new edition which has appeared during the course of time there have been only two authentic sources to draw upon; the copyist’s manuscript of the score with Beethoven’s own corrections and the first edition in parts from 1808 which was published in Vienna and which contains a few revisions dated after the aforementioned manuscript.

Though no new sources have been available for this new edition, numerous editorial emendations...