April 29 in opera music history

1854: Premiere of Giuseppe Verdi's opera 'Il Trovatore' at Teatro Apollo in Rome.
     https://en.wikipedia.org/wiki/Il_trovatore

1899: Birth of Sir Thomas Beecham, English conductor and impresario, known for founding the London Philharmonic and Royal Philharmonic orchestras and for his interpretations of opera.
     https://www.britannica.com/biography/Thomas-Beecham

1933: Birth of Zubin Mehta, Indian conductor and musical director, renowned for his expressiveness on the podium and interpretations of operatic repertoire.
     https://www.britannica.com/biography/Zubin-Mehta

1968: Premiere of the musical 'Hair' on Broadway, which, while not an opera, influenced the development of rock operas and contemporary musical theater.
     https://www.history.com/this-day-in-history/hair-premieres-on-broadway