I’m reading through a writer’s guide to characters, and I came across this:
Brass players are more extroverted and happy-go-lucky.
String players are more neurotic than other musicians.
Pop musicians have psychological problems.
Opera singers are extroverted and conceited.
Search your feelings, you know it to be true.

Semi-related posts:
What about pianists that like jazz?
Swingers:
http://www.tedrosenthal.com/practice.htm