Here you can find my collection of free sheet music! Click the links for .pdf (sheet music), .mp3 (played MIDI), .mid (the MIDI itself) or the title for a .zip folder of it all (Dropbox link).
Songs are listed in alphabetical order by title for convenience; Japanese songs mostly use their Romanised titles. Or, Ctrl-F to quickly find the song you're after! Anime songs also have their anime listed. Sorted by anime, Vocaloid and others.