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Here is the official website: http://www.classicalmusichackday.org/
I hope that hopes. The Open Music Initiative (OMI) is also involved in this and this is their website page in regards to the hackathon: http://open-music.org/events/2018/3/16/karajan-blockchain-music-hackathon

Actually, I'm quite curious on your take @cob on the OMI and how it compares to MUSE.

And here is their Telegram link: https://t.me/musicblockchain

I just found out that there will be a live stream on Tursday 4pm CET on the results