Just rate the above poster's song from 0/10 to 10/10, and then post your song for the next poster to rate. If you don't know the song (which there should be a link with it for you to listen to it), punch in ?/10.
http://www.youtube.com/watch?v=RkqJJREe1pY
http://www.youtube.com/watch?v=RkqJJREe1pY