This question pops up regularly - I don;t think sheet music is available for download because downloading infringes composer copyright, so no sites seem to provide any sheet music in accessible form.
right enough Andy, the music has to be out of copyright - I've downloaded reams of classical music, including some you'd think were fairly contemporary, like works by Erik Satie, and there are lots of sites providing free access to VERY old jazz numbers, but I just wondered if anyone had stumbled across, say, anything by George Shearing or of that period. Just a thought