I've been wondering about this recently. I've heard that for many years the two didn't speak to each other (after finishing the musical The Rothschilds), but I've never heard why or what happened. Neither of them were very old and Bock lived until a few years ago. Does anyone have the dirt on what went wrong between the two?
"Contentment, it seems, simply happens. It appears accompanied by no bravos and no tears."