In 2009 Ksenia Leonidova debuted as Olga in Tchaikovsky’s «Eugene Onegin» at the Tianqiao Opera Theatre (Beijing, China). 2010 she sang Waltraute in Richard Wagner’s «Die Walküre» under Kent Nagano with the Russian National Orchestra at the Tchaikovsky Concert Hall. She was also well received in the roles of Olga in «Eugene Onegin» (Tchaikovsky) as well as Lyubasha in «The Tsar’s bride» (Rimsky-Korsakov) in productions at the Great Hall of the Moscow Conservatory. 2012 – 2013 she cooperated with the Brandenburgisches Staatsorchester Frankfurt singing the alto solo in Beethoven’s «9 Symfony d-moll op. 125», «Messe C-Dur op. 86», and Szymanowski’s «Stabat Mater op. 53». Between 2014 and 2016 she portrayed Ottavia in «L’incoronazione di Poppea» (Monteverdi), Ramiro in «La finta giardinera» (Mozart), the title role in «Carmen» (Bizet) and Lucretia in «The Rape of Lucretia» (Britten) in productions of the Opera Studio of the Mozarteum University Salzburg. Her interpretation of Carmen at the Yekaterinburg State Opera and Ballet Theatre, Russia, in 2015 was well received by the public. She also portrayed Maddalena in Verdi’s «Rigoletto» at Oper Schenkenberg, Switzerland, in 2016. In 2017 she sang Flosshilde in «Das Rheingold» (Wagner), Schwertleite in «Die Walküre» (Wagner), and Clotilde in «Norma» (Bellini) at the Staatstheater Nürnberg, Germany. In the same year she celebrated her highly acclaimed debut at the Salzburg Cathedral, Austria, singing the alto solo in Mozart’s «Requiem». In the 2018/19 season she was very successful in the title role of Bizet’s «Carmen» at the Tiroler Landestheater Innsbruck, Austria. In November 2019 Ksenia Leonidova sang Rose in «Der kleine Prinz» by Nikolaus Schapfl in the SZENE Salzburg, Austria. In September 2020 she portrayed Carmen in Baden, Switzerland, in a Boxopera production. At the Immling Festival 2021, Germany, Ksenia Leonidova gave her role debut of Suzuki in Puccini’s «Madama Butterfly». She sang in summer 2022 Schwertleite at the Tiroler Festspiele Erl, Austria. In 2023 Ksenia Leonidova took part in the festivals «Due Mondi» and «La Voce – Das neue Gesangsfestival» with the Bad Reichenhaller Philharmoniker, Germany.

Ksenia Leonidova won international awards such as the prize for the best mezzo-soprano at the «First International Opera Contest “Rita Gorr”» 2019 in Gent, Belgium, the second prize at «The Neapolitan Masters Competition» 2019 in Naples, Italy, the 3rd prize at the «9th International Vox Artis Voice Competition» 2017 in Sibiu, Romania, the 2nd prize at the 20th international competition «Ferruccio Tagliavini» 2014 in Deutschlandsberg, Austria, as well as the 1st prize of «The International Competition of mezzo-sopranos in memory of Fedora Barbieri» 2012 in St. Petersburg, Russia. In addition, she was awarded the diploma of a finalist at the VIII Elena Obraztsova International Competition of young opera singers 2011 in St. Petersburg, Russia, at the XI International Opera Competition “Ottavio Ziino” 2012 in Rome, Italy, at the V International Opera Competition “Alfredo Giacomotti” 2013 in Stradella, Italy and at the IV International Opera Competition “La città sonora” 2013 in Cinisello Balsamo (Milano), Italy.

Ksenia Leonidova participated in important music events and festivals in popular halls all around the world. In concerts she performed amongst other pieces the mezzo-soprano solo in Tchaikovsky’s cantata «Moscow», the alto solo in Joseph Haydn’s «Paukenmesse», «Theresienmesse» and «Harmoniemesse» and Vivaldi’s «Stabat Mater». Tours took her to China, Georgia, Israel, Germany, Russia, Austria, and Italy. In addition she is a regular soloist at the Franziskanerkirche Salzburg and at the Salzburg Cathedral.

Ksenia Leonidova worked with stage directors such as Giancarlo del Monaco, Brigitte Fassbaender, Alexander von Pfeil, Georg Schmiedleitner, Stéphane Braunschweig, Georges Gagneré, David Schnaegelberger, Hermann Keckeis, Karoline Gruber, Eike Gramss, Laurence Dale, Ludwig Baumann, and conductors such as Kent Nagano, Michael Güttler, Gennady Rozhdestvensky, Giuseppe Sabbatini, Giuliano Betta, Gianluca Martinenghi, Fabio Mastrangelo, Saulius Sondeckis, Daniel Cohen, Andrea Fournier, Howard Griffiths, Rudolf Tiersch, Marcus Bosch, Volker Hiemeyer, Gernot Sahler, Kai Röhrig, János Czifra, Andrea Sanguineti, Tommaso Turchetta, Seokwon Hong, Luca Bagagli, and Erik Nielsen.