In the summer of 2006, thousands of theatergoers, stargazers, and people who enjoy Marxist German classics braved impossible heat to attend a production of Bertolt Brecht's "Mother Courage and Her Children" in Central Park. It was more hoopla than Brecht ordinarily receives, even by the standards of the New York stage. But this Public Theatre production was somewhat out of the ordinary. Meryl Streep and Kevin Kline were starring in a new translation by Tony Kushner, directed by George C. Wolfe with music by Jeanine Tesori. And it was free.