The 29th piano sonata (also called Große Sonate für das Hammerklavier) is one of the most difficult works for piano solo ever written by man. It is a bit long, though, so make sure you have about 40 minutes to spare before you start listening to it.
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As usual, we want to thank Bunji Hisamori for his kind permission to post the above audio rendering on our blog. The midi file was downloaded from The Classical Music Archives. You can find some technical details and the previous sonatas from this series here.
The Hammerklavier is most certainly one of the most difficult works to master. Thanks for all the wonderful links.
Magic! Thank you, Gramo!