Chartbeat Spotify Application. Very beta :)
You need a Spotify developer account to use the application.
mkdir ~/Spotify
cd ~/Spotify
git clone git@github.com:chartbeat/spotifyapp.git apps-chartbeat
(restart Spotify)
enter 'spotify:app:chartbeat' in the Search box
Not a lot of time was spent on this, so there are plenty of issues :)
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it seems like you can't "favorite" a developer app, at least not on OS X, so you have to search for the app on each app start. Pretty tedious.
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the app plays the song over and over as long as you are over the threshold. Obviously not optimal.
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it is fairly unclear what the lifetime of a Spotify app actually is, since the docs are clearly wrong. Currently on OS X, the app works fine "in the background".