I did know. It's a great song and that is a hell of a performance. Is that they same lineup you saw? They sound great.
No. The line up I saw was the drummer that you see there and the bass player that you see there, making 3 total. All of his buddies are multi-instrumentalists so there is a lot of depth there. The bass player for example, was playing the flute bits when I saw them. Sandro's music has a bit of Jazz structure to it too, so I would guess that they're all able to transcribe quickly. One difference with that song in particular is that the flute part that is the long linear progression of scale, up then down the up again, was played by Perri himself on his guitar. That's how we hear it on the album as well. I find it's a much more satisfying part on the guitar than the flute. That's just preference though.