The Requiem Mass in D minor (K. 626) by Wolfgang Amadeus Mozart was left unfinished at the composer’s death on December 5, 1791. A completion by Franz Xaver Süssmayr was delivered to Count Franz von Walsegg in 1792; von Walsegg had commissioned the piece for a requiem Mass to commemorate the February 14 anniversary of his wife’s death. The lyrics of “Dies Irae” (Day of Wrath) are derived from a thirteenth century Latin hymn.
Süssmayr must have completed a great deal of this movement; as Classic FM reports, “In July 1791 an ‘unknown, gray stranger’ turned up at the composer’s door saying he represented someone who wanted a Requiem from Mozart on the understanding that he not seek to learn the identity of his patron.
Spooked by the commission, Mozart threw himself obsessively into the work. But it was all too much. He was only able to complete the Requiem and Kyrie movements, and managed to sketch the voice parts and bass lines for the Dies Irae through to the Hostias.”
There are several short sections: D minor, F major, C minor, and finally returning to D minor. Many thanks to regular contributor JB for this submission!