I can't recall a time when an a cappella performance has really resonated with me as this time. And I guess I sort of miss the pre-concert anticipation and post-concert high (when the music completely fills one's head)... as a performer.
I did do some improvisational whistling in the stairwell. A remix of "Scarborough Fair". Pop version. The kind that one can snap fingers to. With lots of gratuitous suspensions in half steps and allargandos to prolong the moment of illusory blissssssssssssss. Come to think of it, I have never remixed that song before, and it has a nice pulse to it.