There’s a trope in musicals—especially Disney musicals—called an “I Want” song: the protagonist introduces us to their status quo, and tells us about how much more they want. Think “Part of their World” from The Little Mermaid, “I Wish” from Into the Woods, “How Far I’ll Go” from Moana, “Somewhere Over the Rainbow” from The Wizard of Oz, or one of my favorites, “Going Through the Motions” from the Buffy the Vampire Slayer musical episode “Once More, With Feeling”:
Every single night
The same arrangement
I go out and fight the fight
Still I always feel
This strange estrangement
Nothing here is real
Nothing here is right
Over the course of the episode, Buffy explores her feelings of detachment and her lack of inspiration in doing her job keeping the world safe from vampires and assorted monsters (she died, she got brought back, it was a whole thing), as well as feeling unmoored back in the world of the living.