The moment is finally here: The new musical If/Then is currently playing at the National Theatre in Washington, D.C.! Tony winner Idina Menzel joined co-stars Anthony Rapp, LaChanze, James Snyder, Jerry Dixon, Jenn Colella, Jason Tam and more for a “sitzprobe” (a fancy name for when the actors rehearse with the orchestra for the first time) and we’ve got an awesome video of the stars singing a few songs from the world premiere musical by Tom Kitt and Brian Yorkey. Directed by Michael Greif, If/Then tells the story of a woman who moves to New York City to make a fresh start before her 40th birthday. Click below for a sneak peek of the stars in action, then see them in D.C. through December 8—and on Broadway beginning March 5, 2014!