I've enjoyed many of the end credits song for the different episodes of TWD, especially in season 2. But only with this last one did I take the time to write down what the song was. Here it is, originally released in 2006, "The Salty Seas" by Devics:https://www.youtube.com/watch?v=m9c6ZI83CgQ
Never heard of 'em. Seems like an unknown group, but I think this song is about to garner a lot more attention.
What an absolutely beautiful song, capping off the episode very well.