Amazon music unlimited is 0.99 cents for 3 months, I guess not a bad option if you want to listen to U2 on computer before your free CD from ticketmaster shows up. You can cancel I assume right away like most of these feee trial things or you'll get stuck paying like 8 bucks a month for a service you don't use. But I don't know the details. Just an idea.
If you have already ordered the CD or are about to, then I don't see anything wrong with downloading a free copy from the torrents to listen to it while waiting for your CD to arrive.