I found (when I created my avatar) that it's retro-active. It shows up on posts that I made before I added it to my profile, so I'm guessing it's a dynamic thing that loads when you load the page.
Thanks for the kind comments on my music, by the way.
Although I suspect that jazz was what my parents had in mind when they decided on the clarinet, all I can remember playing in the school band was a few classical sounding pieces and an occaisional marching piece. Definitely no jazz or, worse, no rock 'n roll!