Beethoven - Moonlight Sonata 3rd Movement (aka Piano Sonata No. 14 in C♯ minor "Quasi una fantasia", Op. 27, No. 2 Presto agitato)

http://www.youtube.com/watch?v=oqSulR9Fymg

Piano Sheet Music (All three movements)
http://www.mutopiaproject.org/ftp/BeethovenLv/O27/moonlight/moonlight-a4.pdf