Napster is offering a 7 day free trial.
You could also...
Sign up for a 3 Month Pass and get 15 MP3 song credits and 3 months of access for just $15. Also try out the 1 year service for $60. You can transfer unlimited music to players from Sony, Creative, SanDisk, and more, as well as music phones from Samsung, Motorola, and Nokia - all without paying per song.
The Napster service has expanded its catalog to 10 million tracks. Annual membership includes 60 mp3 downloads and unlimited (streaming) playback of the library with your internet connected computer