Although she has achieved success in a wide range of operatic repertoire, Montalvo is particularly associated with the title role of Berg’s Lulu. Following her debut in the part at the Opéra National de Paris, Le Monde described her performance as a true revelation: “The American soprano possesses real stage and vocal presence, and executes the exhausting role with incredible intensity”. Subsequently, Lulu has become the centerpiece of her stage work; she has performed it at houses including Deutsche Oper Berlin, Théâtre du Capitole Toulouse, Teatro de la Maestranza, Theater an der Wien, Komische Oper Berlin, and at Theater Basel, in the acclaimed production by Calixto Bieto.

Outside the opera house, Montalvo has a particularly close working relationship with Christoph Eschenbach, who has been both a mentor and a regular concert partner throughout her career. Since conducting her Carnegie Hall debut with the Philadelphia Orchestra, he has invited her to work with him alongside orchestras including the Vienna Philharmonic, the Houston Symphony, the London Philharmonic, the Munich Philharmonic and the Orchestre de Paris. Most recently, she performed the role of Sophie in a concert performance of Der Rosenkavalier with the National Symphony Orchestra under his baton at the Kennedy Center in Washington, DC.  

She has also worked with conductors including Daniel Harding, Vladimir Jurowski, Christopher Hogwood, Yuri Temirkanov, Bernhard Kontarsky, Sylvain Camberling, Sussana Mälkki, Lothar Zagrosek, and Sir Neville Marriner, and with orchestras including the Cleveland Orchestra, the Los Angeles Philharmonic, the San Francisco Symphony, St Petersburg Philharmonic, DSO Berlin, SWR Sinfonie-Orchestra, RSO Wien, Finnish Radio Symphony Orchestra, and the Bamberger Symphoniker. She has performed at houses including Opernhaus Zürich, Bregenzer Festspiele, Gran Teatro del Liceu, Baden-Baden Festspielhaus, Teatro Real de Madrid, Glyndebourne Festival Opera, Theatre du Chatelet, Théatre de Geneva, La Monnaie de Munt, Opera de Monte Carlo, Lithuania National Opera, Polish National Opera and Opera Comique.

Mirian has also lead Korean Symphony Orchestra, Orchestre Philharmonique de Radio France, the North Macedonian Philharmonic Orchestra, the Polish Baltic Philharmonic Orchestra, and all major Georgian orchestras and choirs.

He has worked with world-renowned musicians, including Eliso Virsaladze, Paata Burchuladze, George Gagnidze, Nino Machaidze, Valeriy Sokolov.

Mirianis the first participant in the history of the Conductors’ Academy with the Tonhalle-Orchester Zürich, who has won both the “Paavo Jarvi Scholarship” and the international audience vote.

Mirian’s Viennese debut in the Musikverein with the resident chamber orchestra was rescheduled due to Coronavirus to the season 2023/24.
Mirian will return to the Berlin Konzerthaus with the Tbilisi Youth Orchestra at the “Young Euro Classics” in August 2023. 

Since 2021 Mirian has served as an invited faculty member at the Iceland University of the Arts, where he teaches conducting classes and leads the university choir.

In 2020 he earned his doctoral degree in conducting at the Academy of Music in Krakow.

At different times the Orchestra was directed by the conductors Aleksandre Gvelesiani, Grigol Kiladze, Aleksandr Gauk, Shalva Azmaiparashvili, Odissey Dimitriadi, Jemal Gokieli, Zakaria Khurodze, Jansugh Kakhidze, David Del Pino Klinge, Vakhtang Matchavariani; also, music directors: composers Andria Balanchivadze and Alexi Matchavariani.

In 2005 Georgian State Symphony Orchestra, together with other State status collectives, was united in newly established Georgia National Music Center and 25 years old composer Nikoloz Rachveli was invited from Vienna University of Music and Performing Arts as an Music Director. From 2007 he has combined the position of principal conductor of the Orchestra.

The Orchestra has implemented lots of successful performances. Among them are concert tours abroad in various worldwide famous venues, such as the Moscow Conservatory Grand Hall, Berlin Philharmonic Concert Hall, Amsterdam ConzertGebau, Athens and Frankfurt Concert Halls, Paris Les Invalids, Pierre Cardin Center, UNESCO Hall & Salle Pleyel, St. Petersburg Schostakovich Philharmonic Hall, Tallinn NORDEA Concert Hall, Berlin Konzerthaus, Brussels Palais de Beaux Arts BOZAR, Strasbourg Convention Centre, Hamburg ElbPhilharmonie, Frankfurt Alte Oper, etc.

During 94 years of its existence, the Orchestra’s repertoire includes all the most important pieces of the Georgian symphony music and numerous masterpieces of the world’s symphony and opera music. The Orchestra is the first performer practically of all important National symphony music pieces, as well as performs Georgian premieres by numerous foreign composers.

In 2013, due to the reform at the National Music Center of Georgia, the young talented musicians of the new generation, successfully performed in the various Orchestras of Georgia and abroad, joined the State Symphony Orchestra. Thereafter the renewed Orchestra is called Georgian Philharmonic Orchestra. During the same year, the outstanding Georgian Musicians: Giya Kancheli, Alexander Toradze, Josef Bardanashvili, Paata Burchuladze and Shalva Mosidze were elected as an Artistic Council. Georgian Philharmonic Orchestra is the first Orchestra in Georgia, who has received the right to choose its creative director (before this position was appointed by the Georgian Minister of Culture). In December 2013, Maestro Nikoloz Rachveli was chose as an Music Director and Principal Conductor of Georgian Philharmonic Orchestra and thereafter Orchestra performed lots of successful concerts with the invited Georgian and foreign musician-performers in Georgia and abroad.