At about the two minute mark, the background riff sounds just like the intro theme.

I was rewatching season 1 when me father walked into the room. He asked what I was watching and I told him WOT. He said, "Cool how they reworked that Zeppelin song." When I asked what he meant, he said go listen the the third Led Zeppelin album, the song 'Friends'". I did, and damn if he is not right. I am looking for others thoughts. Listen all the way through the song.