Yep you can email them. You can also network the 2 computers. You can copy the songs onto a cd-rw or zip disk or similar or external HDD & copy them across. If you both of iTunes & are networked then you can listen to each other's playlists. If she has a p2p gnutella program that can utilise magnet links then you can create magnet links for your songs & can downld them via her program (but both computers & p2p programs would need to be open at the same time.)