Execute the following commands:
:~$ sudo apt-get install pulse-audio-module-raop paprefs :~$ paprefs
Make these changes:
check "Make discoverable network sound devices available locally" check "Make discoverable Apple Airtunes sound devices available locally"
Reboot (or restart pulseaudio)
Go to Sound Preferences – Output (by clicking on the speaker in the taskbar)
Select Base Sation as output
Start your favorite radio station (Pandora?), mp3, etc..