In Ted's defense, most of the amazing karaoke songs are romantic ones, and Shallow is relatively mild. And Ted is definitely going to sing an equally (if not more) romantic one with Beard, though that one will definitely be more amusing than actually stirring.

When it does come time for Ted and Rebecca to sing, Ted can't help himself, and ends up looking right at Joan as he sings the line "I'm falling." There's only so much subtlety he's capable of, though for most of it they're just playing up the drama of the song. And Rebecca is, of course, amazing.

However, there is definitely a fairly equal amount of decent singers and not-so-great singers, so Joan shouldn't feel alone in that regard. The audience is equally encouraging regarding of skill level, everyone cheering and hooting. And Ted is cheering loudest of all when it's Joan's turn.