Music theater and contemporary opera play an important role in Jernberg’s artistic work. She participated in performances of Arnold Schoenberg’s Pierrot Lunaire in 2010 and Salvatore Sciarrino’s Lohengrin in 2014 by the Swedish ensemble Norrbotten NEO and embodied roles specifically written for her in new works such as Folie à Deux by Emily Hall and UR_ by Anna Thorvaldsdottir. She was a soloist in a production of Pierrot Lunaire directed by Marlene Monteiro Freitas and conducted by Ingo Metzmacher with Klangforum Wien at the Wiener Festwochen in 2021, as well as at the KunstFestSpiele Herrenhausen and the Festival d’Automne à Paris the following year. 

Jernberg has collaborated with visual artists such as Camille Norment in her pieces Rapture and Lull. She appears as a singer in the film Union of the North by Matthew Barney, Erna Ómarsdóttir, and Valdimar Jóhannsson. As a composer, she premiered Dreams of Our Future for children’s choir, soprano, voice, and chamber ensemble at the Ultima Festival Oslo in 2022 and a work for Ensemble Contrechamps at the Borealis Festival in Bergen in 2023. In 2021, she sang the successful world premiere of Chaya Czernowin’s Atara with the ORF Radio-Symphonieorchester Wien at the Musikverein.  

In 2024/25, Jernberg performs with the Zwerm Ensemble at De Bijloke in Ghent and the Huddersfield Contemporary Music Festival. In addition to singing tonight’s world premiere of Chaya Czernowin’s NO! with the LA Phil New Music Group at Walt Disney Concert Hall, she performs the work’s German premiere with the WDR Sinfonieorchester at the WDR Funkhaus Cologne. She also makes her debuts at the Park Avenue Armory in New York and Concertgebouw Brugge, and performs with Alexander Hawkins at Jazzfest Berlin.