"A digital version of Mozart's musical diary is being put online by the British Library to help celebrate 250 years since the composer's birth. The digitised diary lets people click on and hear music from the opening bars of many of the works it mentions."This is all part of the British Library's Turn the Page series; there's not only the Mozart Musical Diary with 75 musical excerpts, but there's also Leonardo's sketch book, the First Atlas of Europe, and some of Jane Austen's early works. The site requires Shockwave - well worth the download; there's some really beautiful stuff here.
Related: Whether you're looking for Maria Callas arias, Sponge Bob cartoons, or the latest from NPR's Brian Naylor, SingingFish will help you with its dedicated multimedia search service.