There is definitely something more going on here than the two of them simply being serenaded as part of a surprise date. If Posy were here, she'd be squealing in delight right now.

"Looks like they're getting into it," Gale murmurs thoughtfully, pressing back lightly against Lydia. He likes having her against him like this, he realizes in mild surprise. Most of his focus is on the duet before them, however, intrigued that they've gone to such effort and almost a bit embarrassed that they had. But he can't deny that they sound amazing.