Espionage requires an account with Last.fm
To register, visit http://www.last.fm/join
Espionage is a Last.fm scrobbler. Espionage takes what you listen to and sends it to Last.fm for statistics to be built up and to share information with friends.
The latest version offers the ability to view your top played songs and artists along with multitasking support so that your music will still be scrobbled whilst Espionage is not the active application. (Note, it will only scrobble for a maximum of 10 minutes after the application has been exited)