Spotify is one of the best online music service and has some great music tracks. However, what it misses is integrated lyrics. However you can have a plugin which should bring lyrics like interface to your spotify. ListDJ is one such plugin which integrates with spotify to bring lyrics on the fly for the current track that is playing. One thing that is missing though is floating style lyrics.
ListDJ gives you the lyrics of a current playing track on Spotify. All nice integrated beside the main spotify window. No more searching for lyrics!