What does SF Opera music director Donald Runnicles do when he's not conducting Wagner at the War Memorial Opera House? He's conducting Wagner in London. What does SF Symphony music director Michael Tilson Thomas do when he's not conducting Mahler at Davies Symphony Hall? You guessed it: he's conducting Mahler in London. We knew that addicts to Mahler or Wagner existed. But to think that they live in our own backyard? Well, that's just spooky.......