Nuvola Player runs web interface of cloud music service in its own window and provides integration with a Linux desktop (system tray, Ubuntu sound menu, dock menu and notifications). Currently supported services are Google Play, Grooveshark, Hype Machine, 8tracks and other.
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sudo add-apt-repository ppa:nuvola-player-builders/stable
sudo apt-get update
sudo apt-get install nuvolaplayer
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