1/. Yes
2/. Yes provided they are not copyright protected
3 & 4 I'm a little confused. iTunes is afaik two connected things .. firstly the free Apple application that lists, plays, feeds iPods, and downloads from the Apple music store for a charge, per song or album iTunes songs( the second iTunes which are not free.)
Limewire is not, in your context, a site. It is one of many applications which can connect users over the Gnutella network to share files. There are other networks. There are applications which are multi nnetwork applications which work on Gnutella and other networks. It's a pretty huge subject, googling p2p will give you a GREAT many hits!
The ITunes you mention does not from your description seem to be Apple iTunes, so a URL would be interesting.
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