Mmm… love this!
I’ve been digging Gadd’s immaculate grooving behind O’Donel Levy, on the superb Simba album a lot recently.

This performance predates that. And to see Gadd so young – big ‘Fro, but no beard! – is wonderful. And to hear him? Even better.
What touch! What feel! Not super hard and heavy, but light, subtle. Just exactly right! The veritable Goldilocks zone.
This was shot the year I was born. And he’s still with us! What a legend. I’d love to know exactly what the performance was. Who with, etc. I would like to see the whole thing.
LATER…
So, I found the above, on the YT channel of Dutch drummer, Ruben van Roon (quite a dude himself!).
Turns out it’s a quartet of Chuck Mangione (keys and flumpet) and Gerry Niewood (sax), with Tony Levin (bass) and Gadd. Poss’ performing at Montreux, ‘72?