Mark was a true renaissance man, he did it all and did it all well. It's hard to put a value on that kind of musician but priceless comes to mind. As valuable as that kind of talent is to other working musicians it still comes in as a close second to someone who works and plays well with others. You just don't work as much as Mark did unless people genuinely like you and enjoy being around you. Mark was a great guy who loved to perform and it showed onstage and off, it's a great loss for all of us as a community. He will be missed.