The Harmoniemesse in B-flat major by Joseph Haydn, Hob.
Besides flute, 2 oboes, 2 clarinets, 2 bassoons, 2 horns in B-flat, 2 trumpets in B-flat, the mass also calls for choir, timpani, strings, and organ, the latter supplying figured bass for most of the duration.
The Kyrie has "the most striking 'introductory' shock in Haydn's late vocal music ... a rather long orchestral introduction ... [with] unceasing contrasts between soft and loud, and the unexpected entry of G-flat, the flat submediant, in the fifth bar.
[4] The Harmoniemesse was performed at St. Peter's Basilica in the Vatican City for the Mass of the Solemnity of Pentecost on 31 May 2009, which coincided with the 200th anniversary of Haydn's death.
Die Schöpfung & Harmoniemesse (Leonard Bernstein recording)