Kali Hardwick, an American soprano, completed her studies at the Royal Academy of Music. Her debut was as Countess Almaviva ("Le nozze di Figaro") at the Dartington International Summer Festival. At the Hampstead Garden Opera she performed in George Frederick Hendel's "Partenope" as its title role. Also as an oratorio singer, Kali Hardwick has performed in Wolfgang Amadeus Mozart's "Mass in C Minor", Joseph Haydn's "Nelson Mass", Antonio Vivaldi's "Gloria" and Carl Orff's "Carmina Burana".
She has been awarded numerous prizes and scholarships, ia. from the Chadlington Festival Singing Competition, California Women's Chorus and the New Century Singers.In 2017, Kali Hardwick won second place in the American Prize's Frederick and Virginia Schorr Memorial Award.
In the season 2019/2020, Kali Hardwick is a member of the Opera Studio OperAvenir and is in "Il barbiere di Siviglia", "Schellen-Ursli", "Le nozze di Figaro", "Peter Grimes" and "Le vin herbé".

Dmytro Kalmuchyn, an Ukrainian baritone, began his studies in the vocal faculty of M.V.Lysenko National Music Academy of Lviv. Since Dmytro was in the university, he has performed Belcore ("L'elisir d'amore"), Uberto ("La serva padrona"), the title role of Don Giovanni and Conte d'Almaviva ("Le nozze di Figaro") on the stage of the Lviv National Academic Opera and Ballet Theatre as a student in productions of Opera Studio of the M.V.Lysenko National Music Academy of Lviv.
He is the winner of the Third Ukrainian Teodor Teren Yuskiv Young Singers Competition 2010, the XXI Century Art International Competition, Vorzel 2014 and the 7th International Mirjam Helin Competition in Helsinki.
Since 2016, Dmytro Kalmuchyn has been a member of the International Opera Studio of Opernhaus Zürich with whom he has performed in L'enfant et les sortileges, Don Carlo, Lady Macbeth of Mtsens, Lohengrin, Salome, La fanciulla del West, Le Comte Ory, L'enfant et les sortileges and more.

Paull-Anthony Keightley, an Australian bass, graduated from the Manhattan School of Music and the Western Australian Academy of Performing Arts. At the West Australia Opera he made his stage debut in 2016 as Pinellino in "Gianni Schicchi" and in 2017 as Sciarrone in "Tosca". In 2017 he won the Opera Foundation for Young Australians 'Deutsche Oper Berlin Award, received the Richard Bonynge Award as part of the Joan Sutherland & Richard Bonynge Bel Canto Award and became a finalist of the Opera Foundation for Young Australians' Lady Fairfax New York Scholarship as well as of the IFAC Handa Australian Singing Competition.
In the season 2018/2019 Paull-Anthony Keightley was a member of the ensemble of the Deutsche Oper Berlin, where he played a lot in plays such as "La Traviata", "Nabucco" or "The Magic Flute". In the season 2019/2020 Paull-Anthony Keightley is a member of the Opera Studio OperAvenir at the Theater Basel and is u.a. in "Al gran sole carico d'amore", as Colline in "La Bohème" as well as in "Le vin herbé" and "Jeanne d'Arc"