In Napster, you pay $14 a month to rent the tunes. As soon as you unsuscribe, you lose all your tunes.
iTunes on the other hand, you download the songs and keep them. They can only be transferred to 3 PCs, but I put some on a disk and they have gone to more than 10 and everyone can hear them, it's only when transferring directly it counts. I find that iTunes is much better
Put them on a CD, all your mates can copy them to their PCs, and you can listen to them on a CD player. The tunes will also stay on your PC for your listening