Once, early in my career, someone gave me wise advice about photographing events: 'remember, there are two sides to every story. There's what's happening on stage, and then there's the audience's reaction to it.'

Naturally, not every event I work on has an audience in attendance - often, I'm at a dress rehearsal, with only the director & crew - but also, most of the time, the audience (deliberately) isn't lit! So the opportunity to make use of this suggestion isn't always there; but once in a while, the chance comes along, and it's great to be able to take it...