Perhaps this isn't news for anyone of you but I just noticed that the song Windom Earl plays with his flute in episode "Slaves and Masters" is "Questions In a World of Blue" from FWWM

You can hear an instrumental version of the song in the beginning of ep.17 too, during the scene at the Haywards... Beautiful scene, but then Coop says "Harry, I'm really gonna miss this place", Nadine's cheerleading theme begins, Don Calfa appears out of nowhere and all hell breaks loose...