Tonalité : Es-Dur -. Par HAYDN FRANZ JOSEF. Haydn's so-called Great Organ Solo Mass in E flat major is among those works by Joseph Haydn which early in its history enjoyed widespread dissemination. The E flat major Mass, with an unusual scoring including two English horns in the orchestra, was composed around 1770 during the first years of Haydn’s tenure as Music Director for the Court of Esterház…