Ooh, good luck! I love the bassoon! *suppresses thoughts of learning this one next*
I think there is a Romance by Elgar for bassoon and orchestra. I have heard the cello and piano version, though I bet it would work better on bassoon - do you know it? Lovely and very Elgarian!
There's also a famous basson tarantella that I can hear in my mind but the composer's name escapes me. Will post it if I remember. That's a good piece too... (sorry, that wasn't much help, was it?!

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