It always helps to have an entourage.
I had an opportunity to sneak into a Vladimir Horowitz rehearsal at Orchestra Hall. It was amazing experience that I heard more than saw, of course, as I was peeking up from behind a seat in the balcony, trying not to attract the attention of guards seated at the corners of the stage, glaring outward.
Later that afternoon Horowitz came out of the stage door and stood waiting for a limo to pick him up. He was a small man, dressed in unmatched stripes and plaids, who would probably have gone quite unnoticed just about anywhere, were it not for the guards and the limo…
Le Chant du Rossignol...(song of the nightingale) 