Hi there outside :-)
To make it comfortable to have music everywhere around me I played around with daap.
So to set up an audio server with ubuntu, just enter:
apt-get install mt-daapd
Then enter the /etc/mt-daapd.conf and make it fit your needs (adjust the audio directory and so on…).
Because I wanted to hear my music also far away, it was necessary to do some tricks:
1. open the daap port in your firewall, because rhythmbox doesn’t play local daap shares so ssh tunnel does not work
2. tell your local avahi dealer that there is another share outside
Step 2 is a bit longer…
apt-get install avahi-utils
avahi-publish-service -v -H pc.with.music Music _daap._tcp 3689
Than you should be able to start rhythmbox and see the share on the left pane.
Now enjoy your music :-)