For the past 1 2/3 years, whenever I hear a song on Slacker that I like, I have hit the button below the album art that looks like a plus sign with a musical note. I always figured that this would add the current song to a favorites list or something. But I have never been able to figure out any actual real use for this +note button. Sure, the subsequent times that the favourited song plays, the button is lit up in blue so as to indicate that it is remembered as a favorite. But there is no way that I see that indicates that the song is more frequently played, or a place where I can play such a list of favorites. Has anyone figured it out? Am I missing something?