From a New York Times story by Ben Miller headlined “Renée Fleming Adds a New Role to Her Repertoire: Pat Nixon”:

In May 2017, the star soprano Renée Fleming sang the role of the Marschallin in Richard Strauss’s “Der Rosenkavalier” for the last time — and with that, said goodbye to one the roles that had defined her career.

Since then, Fleming, 64, has appeared in concerts and on Broadway, and premiered a new opera, “The Hours,” which was written for her. Now, for the first time in a decade, she is preparing a role debut in the established repertoire: Pat Nixon in John Adams’s 1987 opera “Nixon in China,” which opens at the Paris Opera on Saturday in a new production by Valentina Carrasco.