I've had "Chariot" by Gavin DeGraw stuck in my head for days.
That's not the Firefly part. Well, kinda. Sorta.
Whenever I hear the opening piano, all I see in my mind is Serenity heading planetside through the upper atmosphere. And has anyone actually listened to the lyrics? Flying? The "golden waves" from the chariot (or ship, for anyone who needs the obvious nudge here)? Seems more and more like it fits the show/movie perfectly.