I’m meant to have a favourite song? Oh dear 😛 On the basis that I can’t decide what my favourite song, I’ll go see what Last.fm says is my most played song (http://last.fm/user/Dannilion).
Ballad of Serenity by Sonny Rhodes. This is the theme song of Firefly, my favourite sci-fi show so far. Last.fm says I’ve listened to it 1,652 times, so I guess it would count as my favourite 🙂