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I’ve wondered about this as well and so, it turns out, has Marc Urselli. He is a sound engineer and took the time to actually compare different streaming audio service. He didn’t compare them all, but he did throw Rdio, MOG (no longer around), Beats, Google Play Music, and Spotify into the mix. He measured kbps for streaming music and Mb of downloaded files. It turns out that the quality was different depending on method of listening - Beats was the winner when streaming over WiFi, but the worst when streaming over LTE. He picked Play Music as his overall winner.