In my early years in the production end of the business, I was always told that dimmers/lighting distro, etc., are kept stage right, and monitor mixers are always stage left. And thinking back that seems to be true of every concert I ever saw, even back to 1975, before I started really paying attention. The only notable exception is Willie Nelson, who likes his monitor engineer to be stage right, or so I'm told. However, the theaters built for plays etc., seem to have it set up the opposite. Anyone know the reason why music does it one way and acting the other?