I really appreciate that the music during Thirteen’s first major scene is the very same piece of music that is pretty much the theme song of River Song’s first story. While listening to the track and going to the exact spot it is literally the Doctor telling River he’s going to upload himself to the Library database before River punches the lights out of him and takes his place to do the thing, and then immediately following is the portion that plays after Thirteen presses the button on the console, the TARDIS goes out of control, and the very very end of the track is when she’s falling before the song cuts and screen cuts to black/to be continued.
I know this song way too well. I listened to it on repeat when I still lived in Korea I loved the music from SitL/FotD so much, and because of River. Now I can think of Thirteen as well. Pfff I would.