networking - Streaming music throughout the house on a budget?

I was wondering whether anyone knew of a way to stream music throughout a house on a budget?

I want to avoid spending any money on this (eg. I don't want to buy a d-link style device). It would be ideal if I could use my existing hardware and some open source software.

I have three old(ish) PCs knocking around. I'm happy to stick either Windows or Linux on them. They can all be hooked up to speakers.

The ideal solution would result in:

the same audio being heard from every device (eg. when you hear a beat on one device, you'd hear it at the exact same time on another (so you don't get any echo))

I'd be able to control the source application (eg. the songs lined up) with my iPhone.

I realise I'm being cheeky with those two wishes - but you never know your luck.

Am I asking for too much, or is there a piece of software/protocol out there with this purpose in mind? I've been searching for sometime now, but haven't had any joy.

Thanks in advance.

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