"Und was musste ich jetzt hören?"
I'm with you on that. FWIW my German wife also struggled with how to translate it. I think our best guess is that this was someone who was talking to herself while trying to remember her to-do list her music teacher gave her: "Now, and what did I have to listen to?" or a father is on the computer and his child says "listen to me sing this song" and he says "one minute" finishes his task and then says "Now, and what did I have to listen to?"