Day 15 - a song that is a cover by another artist.
No contest for this one; The Sound of Silence by 'The Disturbed'. I always loved (and still do love) the original. I always thought it was such a beautiful soft melody and a lovely, timeless song. But when this version came along, it's so visceral and haunting, I realised I'd never actually sat and listened to the lyrics before. But this version, because it's so angry and emotional, almost forces you to listen to the lyrics and I can honestly say, I had NO IDEA that the Sound of Silence was such a dark and melancholy song.
I am absolutely mesmerised by this version, especially with this evocatively bleak and dystopian video; and as much as I love the original, it just can't compare.
If you could cast one famous actor in an episode of spn, who would you chose?