After a series of concert shoots for experience and fun, I noticed, whatever WB I set, it eventually, did not matter.
I found out ambient White Balance was determined by the colored studio lights and how they were manipulated by the stage director.
These are some shots from the recent concert I went to at the Roxy Theater, Sunset Strip, Hollywood last Monday, 23Sep2013.
red - blue - "white"
I figured , must be those array of colored lights that made the "ambient light".
I guess, I'll just set WB to auto in future concerts,.