Aric MacDavid Trading on Mercer Ellington's "Things Ain't What They Used to Be"

I had an absolute blast trading off with Bryce Poplawsky here! Unfortunately, I have forgotten the name and composer for this wonderful blues that we performed as an encore (which is a little frustrating considering that, based on the head, it seems like a commonly played tune). If anyone knows the name of this blues, please post it in the comments below!
(edit: Huge thanks to Bruce Stinnett for telling me the name of the blues in question!)
Performed by the UPS Jazz Orchestra. Recorded in Schneebeck Concert Hall at the University of Puget Sound in Tacoma, WA on May 1st, 2019.