The staircase ballet song isn’t entirely instrumental: they kept the hymn-like vocals from the original song, and they play during the part where the two staircases meet and the two boys look at each other lost and hopeful or whatever it is that the script says.
Well @accio-hogwarts-a-history is a genius and pointed out that those aren’t just random breathy “aaa"s and "eee"s but actual lyrics that say "hold me” and “darling please” (I’m talking about the part that starts at 2:11 here, though the lyrics might be easier to make out from the live version) and we were wondering if they kept any of this for the play.
Left channel is from the studio album version and right channel is the play version. I still think all of it sounds like assorted “aaa"s and "eee"s in both the original and the play version
but who am I to argue with the lyrics so “hold me darling” it is.