For sharing music online, I'll either link to the official YouTube video for a song, if there is one, or link to it on Grooveshark (http://grooveshark.com) (streaming only, legal). You can get URLs for individual songs by clicking the little triangle button on a song's icon when it comes up on the playlist. The nice thing about Grooveshark is that if you create a username (free), you can also save whole playlists and link to them, as well. I'm sure just a list of songs would be fine, too. (Mods, please correct me if I'm wrong)

best,
Aliana
*not a mod*
*spends way too much time on Grooveshark*
*author of Meta card, looking forward to your music selections ;)*