SpotDJ is a service that adds a something new and, frankly, !*#$@ing awesome to your music listening experience. You listen to your music just like normal, but every once in a while, SpotDJ will play a spot between songs. A SpotDJ is also a person and by using SpotDJ you become a SpotDJ. If youre listening to a song and have something to say about it, just flip to SpotDJ, click the Spot this Song button and record your spot.
Other SpotDJs listening to that song will hear your comments at the end of the song.