Spotify, the digital music service has released v0.9.10 of its community edition GNU/Linux client. Currently the package is available for 64-bit only. While the canonical Debian installation instructions are available, you can download the appropriate deb files straight from here and install it, i.e. instead of adding the PPA (or repository) download the packages directly. Works fine on Ubuntu 14.04.
If you are having issues with track change notifications, run
$ spotify --ui.track_notifications_enabled=false
Note that the Spotify service is not available outside US.