„Die Künstlerin wird von der Presse als „phänomenal“ und „unwiderstehlich“ bezeichnet. Sie ist eine Menschenrechtsaktivistin und offizielle Botschafterin für Amnesty International Schweiz & Art for Human Rights. Ihr außergewöhnliches musikalisches Können konnte sie auch im Repertoire des späten XX und XXI Jht, u.A. in mehreren Uraufführungen beweisen. Daletskas Stimmumfang beträgt über 3 Oktaven.

In 2023/24 she can be heard in Lübeck as Siébel in the premiere of "Faust" by Ch. Gounod and as Olga in the premiere of "Eugene Onegin", among others. The Handel Festivals Halle and Göttingen commissioned a solo concert programme from her, which had its premiere in summer 2023 (around Handel's Agrippina). In autumn 2023 her second CD will be released under the direction of Max Volbers and Mayumi Hirasaki as concertmaster. Her debut with Concerto Köln is planned for 2024 with a Bach/Scheibe programme, as well as her debut at the Vienna Musikverein under the baton of Jakob Lehmann with a Mozart/Händel programme.

Since 2015-16 she has been a member of the ensemble at the Nationaltheater Mannheim. Here she made important role debuts, including Ulrica (Un ballo in maschera), Amneris (Aida) and Klytämnestra (Elektra), Adalgisa (Norma), Eboli in "Don Carlos" and Azucena in "Il trovatore". In 2019-20 she made her role debut in the lead role of The Nurse in R. Strauss' opera "The Woman without a Shadow".

With her role debut as Kundry in Michael Thalheimer's new production of "Parsifal" at the Rheinoper in Düsseldorf, and Waltraute in Andreas Homoki's new production of "Götterdämmerung" at the Zurich Opera House, the 2023/24 season has two exciting Wagner premieres in store for Sarah Ferede.

Past roles included MÉDÉE at the Zurich Opera House with William Christie, CHERUBINO at the Bavarian State Opera Munich with Christof Loy and Konstantinos Carydis and at the Munich Opera Festival 2018. She also appeared at the Grand Hall Budapest as a soloist in the JEREMIAH SYMPHONY under Dennis Russel Davies The title role in Calixto Bieto’s production of CARMEN, and the tragic figure of MÉDÉE by Charpentier with Nicolas Brieger and under the musical direction of Andrea Marcon were very special adventures and great successes.

Dutch mezzosoprano Olivia Vermeulen has established herself in recent years as a versatile soloist of international standing. Having celebrated her début at the Opéra National de Paris in 2019 performing the lead role of Abel in a Romeo Castellucci landmark production of Scarlatti's Il primo omicidio conducted by René Jacobs, Ms. Vermeulen returned to the Berlin Staatsoper, where in 2016 she had made her tumultuously celebrated début in the lead role of Turno in Steffani's Amor vien dal destino. Her exciting new solo CD, Dirty Minds, with pianist Jan Philip Schulze, was released by Challenge Records, including a release concert at the Concertgebouw Amsterdam in 2020. Upcoming projects of the 2020-21 season comprise her highly-awaited debut as Idamante in Mozart's Idomeneo at the Zurich Opera House.