Any attentiveness at all is intimidating, but Gaeta knows that he has a decent voice and that the slow Tauron classic that he'd picked (the selection in this place is remarkable, truly) is well within his range. Still, public performance isn't his forte and he's a bit sheepish when he joins Jack. Maybe the tiniest bit self-satisfied, too.
"That's the most enthusiastic review I've ever gotten. Thanks for that."