If I have a score that is in the top ten or around there, I like to keep an eye on it when I start the game to see if I've been pushed down or not. I think one of the "play this" tabs after the main menu should be the song with your highest leaderboard rank, or maybe even any songs in which you are in the top ten.
Even better would be if you could mark any song in your library as a favorite to display on that tabs menu. That would be awesome!! Anyone agree?