Caucasian Chalk Circle is considered by many to be one of the seminal plays of the 20th Century. Here’s some background from Wikipedia…
“The Caucasian Chalk Circle (Der kaukasische Kreidekreis) is one of Bertolt Brecht's most important plays and one of the most regularly performed German plays. It is one of a group of plays written by Brecht during his six-year stay in the United States, and was first staged in May 1948 by students at Carleton College in Northfield, Minnesota.
"The play is often regarded as part of the epic theatre (episches Theater) tradition. The motives used in the play are taken from the Bible, Buddhist and Islamic narrations, and the 13th-century Chinese piece Hui Lan Ji by Li-Xing-dao.”
It's not exactly like 3Penny Opera.
The complete summary of the show can be found at the below link.
(The internet is your friend

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Wikipedia on CCC