network music server

I am trying to find a product that has an embedded OS on it that I can use to play music to my hold music. Basically it needs to be something that people can just remote into and drop mp3's in. Kind of like a fire and forget it is not something I want to be wasting my time going into. I just want it to play mp3's and thats it. Does anybody have an idea on any products out there that can do this. Thanks.