Can't think of anything to listen to, despite having 20 million songs at your fingertips? Remedy this post-modern problem with computer science -- specifically, the Electrospective app for massive streaming service Spotify. With 6 million paying users and 24 million free users in 28 countries, Spotify is a leviathan with a library that can easily overwhelm. Spotify allows third parties to run their own apps within the streaming service, and that's where Electrospective comes in.

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