The musicians I know love to improvise, there's just not much of an outlet for it in the regular concert circuit. One of the attractions of the period instrument world is that musicians have more freedom from conductors, and more opportunity to interpret, even if it's only with the odd ornament.
One thing that frustrates me greatly about the photography world is its insularity. At my most cynical I think it's a sign of there being too many professional photographers: just as I think governments work better if they are not full of career politicians. Take a look at Gavin Bryars' motivation for writing a piece called "On photography":
http://www.gavinbryars.com/Pages/on_..._album_fr.html
(Paragraph four, if you like to speed-read.) By comparison, photography seems very narrow and determinist in its choice of motivations.
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