Loki begs to differ. The time with the wedding dress absolutely counts. Although even at that rate, Loki probably fit a traditional feminine ideal better, dolled up as Thor's handmaiden.

He was already following Thor to the stage, but when he's grabbed he doesn't resist or even grumble, caught up in Thor's mood. He's laughing a little, needing a moment to steady himself on stage. It's a good thing there are two microphones, or they might end up tussling over possession of the one, even if objectively neither needs one to be heard. Thor can be way louder, but Loki is not incapable of projecting.

And his musical education has been well-managed by Frigga. It behooves a prince to have some courtly manners, particularly a prince that's better built for diplomacy than battle. He was taught extensively, and wasn't shy of using his skill and charm at diplomatic functions. Someone no doubt had some sort of amusing comment about him allowing himself to be paraded around like a trained pet, but that joke would not have been uttered around any of the royal family themselves.

"Oh, really? I can sing anything better than you," he fires back at Thor with sparkling eyes. One would almost think they planned that as a segue from the way the music starts up right after.

No one performs improv like the sons of Odin?