Every great montage begins with a great song turned on its head. ''What a Wonderful World'' was actually co-written by Bob Thiele, the father of Sons of Anarchy's music supervisor Bob Thiele Jr. ''I just thought if there was ever a place where we could use that song, a wedding would probably be it,'' creator Kurt Sutter laughs. ''There was a part of me that was a little nervous about besmirching Bob Thiele Sr.'s memory with having a montage kill sequence while his song played. But Bob Thiele Jr. was thrilled and took the challenge and completely made it work.'' The Kills' Alison Mosshart recorded the song specifically for the show from her studio outside Dublin.

After reading the script for the final montage — which begins with Opie [(Ryan Hurst)] and his porn-star bride Lyla [(Winter Ave Zoli)] dancing at their wedding — exec producer Paris Barclay, who directed the episode, thought of the show's history with the W.B. Yeats poem ''The Second Coming'' (they've named episodes after segments of it). It begins with the line ''Turning and turning in the widening gyre,'' which gave Barclay the idea to encircle things like the happy couple with the camera movement and to think of the action as unfolding like a dance. ''Even if it's something as sweet as dancing in a circle that turns into killing Russians brutally in slow motion, it could all seem like part of the same poem,'' Barclay says.