Best way to do it is probably post the fic not f-locked with a list of songs (maybe with links to the lyrics), then post the actual songs in a f-locked post.
About the copying for a friend thing...I think technically, they can sue you for that too, it's just that since it's not online and public, it's impossible for them to catch you at it, and since manual copying is so very low volume, it wouldn't be worth their attorney's fees.