[Tifa does match it, only after he's done explaining his answer and before she answers the question. Hers isn't as elaborate, having only one hand to play with while she props her chin up with the other, but she's having fun creating these little tunes with him, and that's what matters.]

Hmm. It's been so long...

[Her feelings of nostalgia paint her features, and in it, there's both a sadness and fondness for simpler times. Time to open the headcanon drawer.]

I was a kid when I started learning. I remember hearing someone play in person for the very first time... was pretty enamoured by the performance. Anyone would've been... I remember thinking that I wanted to be able to do that too.

[With that, she leans back and stares up at the ceiling, kicking her feet against the ground beneath them.]

Not just to be able to play, but to make someone feel what I did. You know...? Calm, at peace with everything. Even for just a little while.

[She breaks out of the reverie with a giggle, bumping his shoulder with hers.]

Hard to follow up your answer, though!