The honest truth is that I have many 'earworms' (check out what challenge inspired this card from more information on earworms). It's like they're on a revolving play list through my head. For this card the song is one that got itself so deeply entrenched in my head one day that even when I was trying to sleep, it kept running through my head. Kind of ironic.
Anyway, these two are quite far from being my favorites on Code Geass - but I just couldn't resist this image of them.