If they all listen for 70 minutes per day, that's 5,000,000 x 84MB per day = 420,000 GB per day of streamed data.
It says it has 5 million users (as of early September probably more now). Per user, that means that it is streaming 160*60*70 = 672,000 kilobits per day = 84 MBytes per day. Spotify says that the average user listens to its product for 70 minutes per day. In Spotify's case, it has two income streams: subscriptions, and adverts. Spotify (and Napster and We7, who we can also treat in this) have two principal costs: streaming (for which they have to pay a per-track fee to the MCPS/PRS, the music licensing group, representing the authors of the music plus whatever their bandwidth costs are) and storage/hosting.
(If you want a little background, Rory Cellan-Jones, the BBC's Technology/Business correspondent, has wondered who is making money in online music streaming.) But I thought that I should investigate more closely: there's lots of misinformation around.
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