SoundtrackThe soundtrack features pieces of classical music, including Beethoven's Symphony No. 9 in D minor Op. 125 "Choral" (commonly known as Ode to Joy), Symphony No. 7 in A major Op. 92, Richard Wagner's Siegfried's Funeral March from Twilight of the Gods, and Gustav Mahler's Symphony No. 3.
Sadly, they're not credited in the manual.