Nuvola Player 2.4.0 lets you access cloud music services, here's how you can install it in Ubuntu 14.04.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:nuvola-player-builders/stable
sudo apt-get update
sudo apt-get install nuvolaplayer nuvolaplayer-flashplugin
According to Noobs Lab:
Nuvola Player runs a web interface of cloud music services in its own window and provides integration with a Linux desktop (multimedia keys, system tray, media player applets, dock menu, notifications and more).More at Noobs Lab
Additional resources for Nuvola Player
Additional Ubuntu resources