...calls the tune.

What an interesting new idiom I've come across recently while reading an article in a magazine. What it means is that "who forks out the money" "calls the shot". Who pays for something tells what it ought to be.

"He who pay the piper calls the tune."

This idiom is much more pictorial and poetic than the synonymous equivalent we have in our mother tongue. It sounds kind of of Irish origin, doesn't it?