I am not Rachel

I Am the Doctor, the iconic theme most associated with the Eleventh Doctor, was nowhere to be heard in this episode. Gone was the clever, devilish, “Just you watch me get myself out of this one,” with a wink and a jammy dodger Doctor, the Doctor that almost always appears with a cunning solution whenever this music plays.

Instead, the Eleventh Doctor of this episode has come to terms with his fate and become set in his ways as a literal old man, and it’s not he who pulls out a solution and saves everyone at the end of the day: it’s Clara, when she asks for help through the crack. 

It also seemed worth noting the fact that little Amelia’s theme played when the Doctor spoke to the young redheaded boy Barnable, who wished to fly away with the Doctor in the TARDIS if he was in fact leaving the town. Centuries later, the Doctor mistook another young man as Barnable, and continued to refer to him as Barnable, which seemed symbolic of how he forever could still see Amelia within Amy, and Amelia within any lonely child looking for adventure.

But the saddest and most moving to me was the music that played just before the final phase of his regeneration, right when he slipped off his bow tie, so symbolic of how Eleven can wear a tie like a proper adult should, but only if it’s arranged in a bow and decidedly cool. (Like the Fourth Doctor said, "There’s no point in being grown up if you can’t be childish sometimes.") 

The music, a bit from the track titled The Sad Man With a Box, is the same bit that plays during the Series 5 finale, when Eleven says his goodbyes to little Amelia at her bedside as she drifts off to sleep, knowing that once she is asleep she will never again remember who he is, like a metaphorical death of sorts to him.

(If you recall, he tells her to "live well and love Rory," which could also be seen as a spookily literal and premature final goodbye to her, as Amy eventually leaves him forever to live well and love Rory in another time.)

And what happens just before this music plays and Eleven drops his bow tie?

Amy Pond appears to him, and she tells him goodnight.

Instead of the Raggedy Man tucking her into bed to say his goodbyes (presumably) forever while this theme plays, it’s she who sends him off to sleep this time.

Eleven told little Amelia during that moment that "we’re all just stories in the end." And here, in this new scene, I think that the significance of that line is apparent once again.