The Hero of Canton (http://www.youtube.com/watch?v=V9z6AO5KzIU#normal)
That's right, Strelok is a fan of firefly!
It's a shame i couldn't find the original scene from firefly on youtube. It was a bunch of Adam Balwin singing the song from the DVD release of the TV series.
I do miss Firefly, I remember when it was on...for that one season.