The following listens to an Icecast stream and only extracts the metadata. It does not forward any audio. The below becomes valuable when you want to post "Now Playing" data to digital signage, IRC, or Jabber channels.
Note that there's one line commented out in the above. It's there as an example, for when you want to pass the variable to an external script. About the only other line you'd need to change is the one containing "music.joat". Point that at your Icecast server.
Note: "output.dummy" is needed, to keep LiquidSoap from complaining that there's no output defined.