Google has put out the new cloud music beta service, and currently it is only available in Unite States. About google music beta click here.
Google-Music-Frame is an application to manage google music and it has been added to ppas for Ubuntu Natty and Oneiric.

Ubuntu Natty user can install this app from ppa:janousek.jiri/google-music-frame-releases with the commands:

sudo add-apt-repository ppa:janousek.jiri/google-music-frame-releases
sudo apt-get update
sudo apt-get install google-music-frame

Alternatively, Ubuntu 11.04 Natty and 11.10 Oneiric can install from the google-music-frame daily builds:

sudo add-apt-repository ppa:janousek.jiri/google-music-frame-daily
sudo apt-get update
sudo apt-get install google-music-frame