Why is it always somebody else? Don't shoot the piano player

Today's the day everyone has to return their library books and music here at the Whittaker Library.  (Why is it always someone else's fault that a music part has gone astray?!)

We haven't lost a horn or even a horn part (yet) today, but this cheerful little Flanders and Swann song, "I've lost my horn",  is so nearly appropriate, and at least it cheers us up:-