The world-famous Swan Lake ballet premiered in St. Petersburg at the Imperial Mariinsky Theatre.
Source
Cinderella, the first full-length ballet by Frederick Ashton with music by Sergei Prokofiev, was first presented at Covent Garden, London, by Sadler's Wells Ballet.
The preview of J.K. Rowling's Harry Potter and the Cursed Child was shown at the Palace Theater in London.
The romantic comedic opera 'Marta' premiered in Vienna by Jules-Henri Vernoy de Saint-Georges.
Andrew Lloyd Webber's musical soundtrack, 'Jesus Christ Superstar,' was recorded.
Gypsy opened at Broadway Theater in NYC for 702 performances.