Windows Vista Specific answer. Yes! Just copy your own mp3's into; C:\Users\your_user_name\Documents\Electronic Arts\The Sims 3\Custom Music Obviously you need to change drive letter if your 'Documents' folder is not on your 'C' drive! (Note: DON'T put them into any Sims folder in Program Files)
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yes
It is possible, but I have only seen it on playstation
custom content is legal for the sims 3 and any other game,unless it breaks copyright laws
Here are some custom content sites.The Sims 2 ExchangeThe Sims 3 ExchangeModTheSimsThe Sims ResourceGarden of ShadowsSimbologyMore Awesome Than YouInsimenatorLianaSims2AnnaMariaSims2DecorgalThe Sim SupplyxSIMS.de (mature content)There are plenty more sites than this. If you want more just google "sims 3 custom content".
You don't, unless you hack your GH3 disc on a PC, and add them there.