Nuvola Player (previously Google Music Frame) is a music player especially designed for cloud music. Even though it's only a "frame", it's a great application that comes with features such as Ubuntu Sound Menu (mpris2 - also works with some GNOME Shell extensions) support, notifications, multimedia keys, Unity quicklists and many extra features thanks to user scripts (like last.fm scrobbling for Google Music, etc.).
- a new menu bar and reworked tool bar (and you can select to show them both or only one of them)
- support for SOCKS proxy servers
- various configuration options like: turn off notifications, visibility of tray icon, close button behavior, simple settings for user scripts
You can see the official release notes, here.
Install Nuvola Player (stable) in Ubuntu
sudo add-apt-repository ppa:nuvola-player-builders/stable
sudo apt-get update
sudo apt-get install nuvolaplayer
For Fedora, see: How To Install Nuvola Player (Ex Google Music Frame) In Fedora.
To get the code, report bugs and so on, check out Nuvola Player @ Launchpad.