Playing requests is my absolute favorite part of the gigs these days. We have about 8 hours of solid material that is a ton of fun, but not a challenge at this point. When someone comes up mid set and says, "Hey do you know..." that just hits the sweet spot for me. With War Pigs, we all knew it, but had never played it together. Earlier in the night a fella came up and wanted us to play "Sold" by John Michael Montgomery. One of our singers/guitar players said, "you all play a tune, and I'll go out back and learn it." Three and a half minutes later, he came back in, I pulled up the bass on Ultimate Guitar, and we were playing the tune. I had never even heard it before.
I got blisters on my fingers from having not played the bass much recently though. It was just bad luck that the fill in gig happened the same day as we'd previously scheduled practice. Seven hours of bass in one day is hell on the old fingertips.