Just wanted to comment on the similarities between Song to the Sirens in Lost Highway and Llorando in Mulholland Drive.
It struck me first in Lost Highway how this moment when Song to the Sirens played, how poignant that was, how much the lyrics echoed his feelings of how much he wanted this person of Alice/Renee, how primal & within the the depths of his being this song sounded out of, but how it was forever beyond him. That moment seemed to be echoed within Mulholland Drive, in Club Silencio when Llorando was being sung, that again primal desire of Diane for Camilla, being contradicted by the dawning realization of what she in reality has done to Camilla. For me, these are the moments where the emotional truth of the story in it's full depth breaks through into the narrative.
Other Lynch movies seem to hold true to this structure, in there different ways. Blue Velvet definitely has a turning point when Mysteries of Love is played at the party where Jeffery dances with Sandra (Lynch thought of playing Song to the Siren here, but couldn't afford the rights, and had Angelo Badlamenti compose something similar). I even think there is a similar moment in Twin Peaks, when Rockin' Back into my Heart/The World Spins plays in the episode where Maddie is killed, sort of a similar moment of emotional/spiritual depth for Detective Cooper. As for Straight Story, I'm not sure they're is an equivalent moment, but I felt it definitely whereever Lauren's Walking was played.

