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Right now you can buy and trade muse on open ledger and rudex, however some big things are in the pipeline!

check the FAQ section on the website http://museblockchain.com/
Like nevdull said open ledger and rudex are the only places to get it right now. He is a guide that might help you with that. https://steemit.com/muse/@robrigo/how-to-trade-the-new-muse-token-on-bitshares