Music used by Wolfgang Amadeus Mozart's performances (compositions by W. A. Mozart, public domain):

eine_kleine_nachtmusik.ogg
  Serenade No. 13 in G major, K. 525 "Eine kleine Nachtmusik", I. Allegro (excerpt: the exposition, 0:00-1:08).
  Recording: Musopen, via Wikimedia Commons "File:Mozart K525 Serenade in G Major 1 - Allegro.ogg".
  License: Public domain.

requiem_for_death.ogg
  Requiem in D minor, K. 626, Lacrimosa (excerpt: 0:00-0:46, mixed to mono).
  Recording: IMSLP (PMLP02751), via Wikimedia Commons "File:PMLP02751-S002-07-Mozart Requiem Mass.ogg".
  License: Creative Commons Attribution-ShareAlike 3.0 (https://creativecommons.org/licenses/by-sa/3.0/).
  This excerpt is shared under the same license.
