Ensemble C4 is a Norwegian baroque ensemble working primarily in Norway. With its association with several freelance musicians, the ensemble remains flexible in both its musical expression and size. Since 2015, it has presented several new concert programmes per year and has consequently built up a large repertoire of music taken from the period from approximately 1575 till 1800. With extensive concert experience and great synergy, the ensemble has developed a playful and virtuosic style that thrills audiences and has received critical acclaim. Nine German Arias is the ensemble's first CD release.

Countertenor Daniel Sæther studied at the Royal Birmingham Conservatoire and the Royal Academy in Den Haag. He has performed as a countertenor in Norway and abroad since 2011 with a wide-ranging repertoire from early music to contemporary. From 2018-2020 he was awarded the Norwegian government grant Statens Arbeidsstipend to work with contemporary music for countertenor on baroque instruments and document this in concerts and recordings. In the summer of 2023, Daniel featured as Cesarin the Trygve Brøske's contemporary opera Kommandantenheld at the Oscarsborg open air Opera.

Sæther is a founding member of Ensemble Freithoff and Christian IV Consort (now known as Ensemble C4), both of which perform chamber music in Norway with a focus on Renaissance and Baroque music. In 2020, Saether released the album Unexpected Songs (LWC1204) for which he was nominated as Singer of the Year at the German Opus Klassik awards in 2021. His second solo album in 2022 Vintersong (LWC1236) achieved nominations in four categories.