ring the changes - Phrases/Idioms
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.
Keep varying how one performs an action or says something, as in She went on and on, ringing the changes on the joy of computers. This expression alludes to the art of change-ringing, where a series of church bells are rung in as many sequences, or changes, as possible. [Early 1600s]