Audiostream caching

Hello List, I'm searching for a possiblity to cache a realaudio, mp3 and/or a windowsmedia audio stream. The intension, is to reduce the traffic in the lan, because many guys hear the same stream (radiostation) in our house. Now it would be nice, if a proxy, or any other chaching instance would load the stream, and store it in a cache. So the guys could connect to the local streamingserver to hear the cached stream. Sorry for the post in the security list, but I think it is be best list for such questions. best regards, Hans