Rey
Rey's only been on Eaarth for a short period of time and because of this her musical exposure is fairly limited. She did mention to Hugh that she's fond of Berlin so the song she was guaranteed to do for karaoke was Take my Breath Away. But because she was introduced to Cyndi Lauper by Stephen earlier in the week, she started digging deeper for other 80s musicians she might like and she discovered Joan Jett.
She'll do Crimson and Clover with a little less certainty of the lyrics, which results just in wider smiles and laughs to cover up when she stumbles, but she got 85% of it right.