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Spotify – Large Scale, Low Latency, P2P Music-on-Demand Streaming http://www3.cs.stonybrook.edu/~phillipa/CSE390/spotify-p2p10...

and many others but this is the one I liked the most

That Spotify paper was undated. When was it written?

Presented August 2010 at the IEEE Conference on Peer-to-Peer Computing (P2P)