Main network for backups, Guest for iTunes

I have a 2T TC (4th gen) up and running with both a main network (192...) and a guest network (172...) connected to DSL modem for high-speed internet access.
I want to dedicate the main network for use by family members - computers (4 Macs, 2 PCs), printers, etc. I wish to use the guest network for the kids and their friends to access the internet with their iPods/Pads/Phones, etc. So far so good.
I currently have the kids controlling iTunes/AirPlay into my whole house audio system. I configured an old PC configured as a music server connecting wirelessly to the main (192) net of the TC. It runs iTunes and sends its Apple Lossless CD files to an AirPort Express (wireless OFF, hardwired to Ethernet backbone) which converts them to optical and sends them to an audio receiver for D/A conversion and amplificaiton. The kids have the "Remote" app on their handhelds which allows them to either operate iTunes on the music server (with Dad's old crummy music) or to play their own iTunes music (term used loosely) via the same route (TC main net-> backbone -> AirPort -> receiver). OK, so far so good.
The question is how do I put the music server, AirPort Express and kids' handhelds on the guest network so I don't have to give out access to my main network to "friends of friends of friends"? It seems the Guest Network is only available wirelessly from the TC (on second floor). If i need to add wireless capability where the TC can't provide it (walkout level pool and patio), how can I extend the guest network? I have an older Netgear Wireless Routher that could be used. Also, I have ready acess to the ethernet backbone. Any ideas? Any help would be greatly appreciated.

This is a fairly complex setup so let me toss in a hint.. and you will need to see if you can pursue it. Your ethernet backbone, so called, can run multiple IP address ranges or subnets. It is not obvious but the setup will require you to set addresses manually in the computer.
In OSX Just click the + in the network box and a dialogue box will pop up allowing you to set a secondary connection to either airport or ethernet. Select the one to use and then give the connection an obvious name.. eg secondaryeth1
In Windows PC you can setup secondary IP, but the first connection needs to be manually set as well. ie you cannot do dhcp and then add a secondary IP.
Then select that connection and give it a new IP in the secondary network using manual IP.. only give ip and subnet.. do not use a gateway (router) or dns address.. that will confuse the main gateway of the computer. You can then lose internet connection, and is not required for local LAN connection.
.. end of hint.
Pure speculation.. you might be able to setup a secondary IP on the airport and connect to the guest network. But you will need to be careful that the server pc doesn't simply become a bridge between the two networks.
Or the connection to secondary IP via ethernet might allow it connect to the wireless connection on the TC if it isn't isolated.
The other method is to use your "I have an older Netgear Wireless Routher that could be used."
The trick here would be to use this as a WAP connected directly to the music server, via ethernet, on a secondary IP address. Don't use the guest network on the TC at all.
Whether this would then work to control music to the airport express.. that is where I get lost. And your setup is outside of my experience..

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