"The Little Drummer Boy"
I remember liking and playing this song on my violin and singing it for myself when I was 8, just for fun, so I think it has always been one of my favorites.
Today I heard an impressive and creative cover by a teenager, Sean Quigley, who played all the instruments for the song (drums, electric guitar, keyboards) and sang while his sister shot the footage they used to make the video in 2011:
Sean Quigley - "Little Drummer Boy"
Sean Quigley - Little Drummer Boy (Official Music Video) - YouTube