Piano Forum
http://pianoforum.net/smf/index.php

you can get lost for days reading posts by some of the heavy hitters on this forums (Bernhard, Chuan Chang) Truly a life altering resource for pianists. \:\)
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"You look hopefully for an idea and then you're humble when you find it and you wish your skills were better. To have even a half-baked touch of creativity is an honor."
-- Ernie Stires, composer