Last.fm trial expired. What should i do?

My free trial of www.last.fm radio has been expired. I want to use this service and for FREE. What should i do? Someone told me to put anonymous proxy from UK/US/Germany in the last.fm desktop client. I don't know how to. And i am already using a proxy for internet access.

I like www.surfmusic.de

Use grooveshark.com, it's legal, and has apps for most smartphone OSes.