This song is so perfect for the show, and if I could make a video for it....if I had any idea how to go about it...I would, but, since I'm a little dense about such things, I shall have to ask you good people.
The song is 'Man's Road' by America, written for the film "The Last Unicorn". I can see this as a song for either Sam, Or Dean, or both of them, and it is also very much a Castiel song. I can hear Cas so clearly in the lyrics.
I would just love to see a video to this song.
Here's the complete song as it plays on the soundtrack.