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Yeah, I sing in a chorus, and the rough composition is:

* 10% professional or aspiring professional singers (who are young)

* 20% music educators in their 20's and 30's

* 30% people in their 20's and 30's who are very musically-inclined and studied music a lot as children

* 40% older people who sing as more of a hobby

When I mostly played chamber music, the crowd was also very young and enthusiastic. 21st century composers actually seem to have a better audience than 20th century composers did.

Music in general seems to be fragmenting into many subcultures of very interested people, with the exception of pop music and ironically parts of the classical/opera crowd that see it as a status symbol.