Brahms’s famous Horn Trio op.40, composed in 1865 for the natural horn, is a work of considerable significance within the composer’s output. Up until now the work was believed to have a strong emotional connection to the death of his mother three months earlier. However, Christopher Hogwood draws on a newly discovered source for this Bärenreiter publication, a source that has not been available for any previous edition. We now learn that Brahms wrote at least the trio movement some twelve years...