Why does that dude keeps showing his ass in the clip. And yea that is an oldies goodies number Pesco =D
On a "serious" note: I never got affected by Suwako nor her theme. It is probably the only extra boss in the windows touhou series that feels dull to me. Not because it is Suwako and her hat, but just because it is just. . . NOT impressing (music mainly). Thank god Nue showed up to be the clown of the extra, else Suwako was going to be there at the top all alone.
Suwako compared to Flandre, Mokou, Koishi, Yukari is just lol. Seriously, somebody teach her how to be an Extra boss.