The digitised diary lets people click on and hear music from the opening bars of many of the works it mentions. One featured composition is "Little March in D" that, the library says, has almost never been performed.
From 12 January visitors to the British Library site will be able to browse a hi-tech version of Mozart's Verzeichnuss aller meiner Werke (Catalogue of all my Works).
From BBC News, and follow this link for Mozart's musical diary.
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