Sidsel Aja Eriksen grew up in Als in Southern Jutland and studied in Aarhus with Ingrid Haking Raaby and Bodil Øland and in Amsterdam with Rosemary Joshua. She made her debut at the Jutland Conservatory of Music in 2018.
Among her recent and future engagements is Mozart’s Mass in C minor with Helsingborg Symphony Orchestra, Bach’s Weihnachtsoratorium with Sønderjyllands Symphony Orchestra and Copenhagen Phil, roles of Isabella (L‘Italiana in Algeri by Rossini) at NorrlandsOperan, La Scaramouchee (Fête galante by Schierbeck) at Den Jyske Opera, Cherubino (le nozze di Figaro by Mozart) at Opera Hedeland and Carmen (Carmen by Bizet) at Helsingør Kammeropera.
Sidsel Debuted in 2021 at the Royal Opera in the role of the Flower boy in Nielsen’s Maskarade and the following year she sang a cover of Bevidsheden in Alenius’ Manualen from the stage. She has sung several children's operas around Denmark with Operaen i Midten, toured with Operettekompagniet and on Funen Opera. She has sung Tisbe in Rossinis Cenerentola and the role of Her in Græsset er Grønnere by Oh Land and Adi Zukanovic.
In addition, she has sung several times at Aarhus Summer Opera, including in the premiere of John Frandsen's Year of the Beast 1666 in the role of Anne-Marie. At the Copenhagen Opera Festival, Sidsel was part of the production of Puccini's Suor Angelica in the role of Maestra delle novitie and with Opera Hedeland and Operaen i Midten she sang the role of Papagena in their streaming recording of Mozart's Magic Flute. Also on Opera Hedeland she sang the role of Cherubino in Mozarts’ le nozze di Figaro.
In 2025 she sang her first role at Den Jyske Opera, La Scaramouche in Fête Galante by Schierbeck and the same year she was back with the Royal Opera, joining their summer concert tour as a soloist.
On the international stage, Sidsel made her debut at Läckö Castle in Sweden in the lead role of Tintomara in Werle's opera of the same name and in Germany she appeared on stage at the Immling Festival as the title role in Rossini's Cenerentola. In 2024 she sang the role of Isabella in L’italiana in Algeri by Rossini at NorrlandsOperan.
Sidsel has worked as a soloist with several large orchestras, including Aalborg Symphony Orchestra and Aarhus Symphony Orchestra, Randers Chamber Orchestra, Helsingborg Symphony Orchestra, Sønderjyllands Symphony Orchestra and DR's Symphony Orchestra. With these, she has, among others, sung Moderen in Gade's Elverskud, 2. Soprano in Mozarts’ Mass in C minor, Alto soloist in Bach's B-minor Messe and Christmas Oratorio and Handel's Messiah, Rosina in a concert performance of excerpts from Rossini's The Barber of Seville and the role of the 2nd Tern in the CD recording of Hornemann's Aladdin.
