The music community. This may not be what you're looking for, your question leaves the type of idea open. Not the music community of the internet, which is medi

The music community. This may not be what you're looking for, your question leaves the type of idea open. Not the music community of the internet, which is mediocre at best, but of actual professional and semi-pro players. Musicians are driven, obsessed with subtlety and novel ideas, and highly opinionated. This results in intense and vibrant conversation. The community lacks the BS that plagues tech as it's apparent from a few minutes of playing whether someone is worth their salt. Critique is built into the fabric of musical training. All professional musicians I know take and give constructive criticism in rehearsal and casual settings.