Best Way to Get FREE Songs for Your Zune?

I want to get a 8GB Zune in pink. I have an old 2nd gen iPod Nano and have been using limewire pro to get free songs. When I get my zune, whats the best way to get free songs. I have a laptop now and I dont use the home computer, which is where the limewire pro is downloaded, so I need a new source of getting songs. Does anyone know where or what other software I can use? I heard limewire gets blocked by firewalls a lot, and mine does, and they cause viruses so I dont want to put it on my precious laptop. Any suggestions. I am 16 and buying every song is out of the question.

Thanks!