I ordered on the 23rd aswell (from EB Games) and got my key on the 24th. You might want to check out the LotRO forums if you haven't found a solution already. GL mate.
I think its an awesome idea. I played the beta but didn't bother trying the instrument out, had I known I could make my OWN music, I would have been more inclined. Now that I know, I'm going to be giving it a shot too (when my preorder gets here!), …