call the tune

call the tune idiom
Make important decisions, exercise authority, as in Nancy said that it's her turn to call the tune. The full term is Who pays the piper calls the tune, meaning whoever bears the cost of an enterprise should have authority over it. [Late 1800s] Also see the synonym call the shots.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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