And I think that there's no feeling at all like standing on a stage with a bunch of musicans, creating something that is, by its very nature, ephemeral. That's part of what I love about it - you play it, you're done. If you wanna hear it again, you play it again the next night, when it'll be different.
The moments that I remember are usually little things - playing with a second line band in front of a few thousand people at a street festival, and at some point, tossing a cowbell and a beater to the burnt out monitor guy, who'd been on stage for 3 days. And having him wake up and start rockin' along with us. it wasn't about what I did, but about how HE reacted. or seeing some little old lady get all teary eyed when the singer did "Embraceable You" at a retirement home - obviously a story there - one that I'll never know. Playing with a full orchestra - nothing else is like it. Or even the night that the guitarist and I both ended up with feedback a third apart (I had to have been using some sort of really obnixous distortion box to even get my bass to feed back) - and letting it sustain for minutes while the singer scatted around around what we were playing, creating all sorts of interesting chords...
I'm a couple of weeks away from finishing a blues/R&B/blues rock project in the studio - and then we're gonna go out and play; we're not too old to rock, though I admit that we MIGHT be too old for people to pay to see us rock.