clemenza di Tito, the title roles of Bellini's Beatrice di Tenda, Donizetti's Anna Bolena, Maria di Rohan and Maria Stuarda, Queen Elizabeth I in Roberto Devereux, Verdi's Luisa in Luisa Miller, Amelia in Simon Boccanegra, Leonora in Il trovatore and Desdemona in Otello, Marguérite in Gounod's Faust, Tatyana in Tchaikovsky's Eugene Onegin, Liù in Puccini's Turandot, and Zarina Marina in Dvořák's Dimitrij. She appeared in productions directed by Giorgio Strehler, Patrice Chéreau, Luca Ronconi, Jean-Pierre Ponnelle, Franco Zeffirelli, Pier Luigi Pizzi, Jonathan Miller and conducted by Colin Davis. Carlo Maria Giulini, Peter Maag, Lorin Maazel, Riccardo Muti, Seiji Ozawa, Giuseppe Patané, Georges Prêtre, Gennady Rozhdestvensky, Wolfgang Sawallisch and Alberto Zedda. She appeared in halls including Carnegie Hall in New York, Royal Festival Hall in London, Accademia di Santa Cecilia in Rome, Concertgebouw in Amsterdam, Musikverein in Vienna, Salle Pleyel in Paris, the Great Conservatory Hall in Moscow. She performed at festivals such as Salzburg Festival, Rossini Opera Festival in Pesaro, Martina Franca Festival, and the Casals Festival in Puerto Rico. Invited by Pope John Paul II, she sang Romanian carols in the First Christmas Concert televised from the Vatican City in 1993, for a television audience of a billion people. The soprano part of Penderecki's Symphony No. 7 "Seven Gates of Jerusalem" was composed for her, and she sang in the world premiere in 1997 in Jerusalem, when the city celebrated 3000 years. Nicolesco returned to Romania in 1991, after the fall of the Communist regime, singing for the first time on a stage in her native country, in a concert at the Romanian Atheneum in Bucharest. As some 10,000 tickets were purchased, Nicolesco gave three consecutive performances. She created the Romanian Atheneum International Foundation and donated in 1994 a Steinway grand concert piano. In 1995, Nicolesco initiated the Hariclea Darclée International Voice Competition and Festival. In the years between an edition of the Contest and the next, she offers Master Classes to the young artists. She obtained for the Darclée events the High UNESCO Patronage. In 2003, she created the Romanian National Festival and Song Competition. She presented for the International George Enescu Year, proclaimed by UNESCO in 2005, the composer's complete songs for the first time in Japan, at Aichi World Exhibition as well as in Nagoya and Tokyo, in Prague, Paris, Rome and New York City. In 2014 she was a member of the jury of the