"A Little Night Music" (1973), with a more traditional plot based on Ingmar Bergman's "Smiles of a Summer Night" and a score primarily in waltz time, was one of the composer's greatest commercial successes. "Time" magazine called it "Sondheim's most brilliant accomplishment to date". "Send in the Clowns", a song from the musical, was a hit for Judy Collins and became Sondheim's best-known song. The show opened on Broadway at the Shubert Theatre on February 25, 1973, and ran for 601 performances and 12 previews. It was revived on Broadway in 2009.