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I know this has been asked numerous times years ago, but I’m still curious to see if anyone has found the answer as to who was playing on the Curb Your Enthusiasm track. Loads of great tuba playing throughout the show. Thanks,

Even more timely:
Curb Your Enthusiasm season 11 episode 1 (just released) ends with its theme song, FROLIC, performed on stage by an orchestra, and we get some good close-ups of the tuba player, who looks and sounds like a professional tuba player actually playing. Who is that?
https://youtu.be/glWWodqZ4LM

Came here looking for the same answer. I don’t know who it is, but he’s unmistakably playing a BMB (F?) tuba. Could be a college student?

I’m not sure who the original player is on the soundtrack, but in that video clip you just shared that is Evan Brock.