[Shamisen... hmm, yeah, he's pretty sure he's heard of those before in Inazuma. But this is most certainly not Inazuma, so that doesn't help him out much.

Still, he smiles.] Of course! Venti the bard, at your service—three time winner of the Most Popular Bard in Mondstadt. [never mind that those wins were in three different centuries, details]

Alas, I'm not sure if that title would mean anything to you, as this place appears to be quite far from Mondstadt indeed.