right so reportedly we got the karaoke scene in the movie because ryan gosling overheard sandra hüller singing to herself in some downtime on set and approached the directors to say "if we have her here and don't ask her to sing in the movie then we're insane," so the scene was hastily planned and recorded during the last day they had with that set; stratt grew up singing in an east german youth choir because hüller did, too. a fun meta textual wrinkle this adds is that gosling is also a singer but grace doesn't take a turn with the mic, so you can read the scene not just as stratt saying "I am a full human being, I just can't be for this project, you get to see it for two minutes before I turn it off again" but additionally "you could be doing this exact same thing but you aren't even willing to give us two minutes." his doomed work friend the trained choral singer, his fated bestie the being who communicates only through song, his world-saving probes named for the most famous musicians ever, his choir-based soundtrack underpinning all his actions, and his unwillingness to ever sing himself.