The Jelly Bean app rips keep coming, first there was the method to install Sound Search onto any Ice Cream Sandwich device (even non-rooted), then there was the method to get Google Now onto rooted ICS devices, now Google Music has been added to that list. The folks at XDA have said that it doesn’t bring a huge change from the ICS version but the most notable change is the widget looking more sleek and it now display album art. Another change is a subtle change to the button layout looks more modern. To find the instructions and downloadable files needed to get the newest Google Music, hit the second source link below.
Source: Xda-developers, Xdaforums