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www.soundcloud.com 

soundcloud is a music streaming service which enables artists to upload their sets and connect with their audience. 
You'll find many genres and artists there, from j-dilla to marek hemmann :-) 
Find a popular artist whose tracks have seen some traffic and you'll be amazed by the neat comment feature. 

I have no personal affiliation to the website or its owners, I am just a big fan of the service and highly recommend 
checking it out until something better pops up.