As a solo soprano, Josephine sang in a performance of Philip Glass's epic Music in Twelve Parts led by James McVinnie at the Barbican (2017), in Morton Feldman's Rothko Chapel with LCO soloists at the Roundhouse (2016), in George Aperghis's La Nuit en Tête with Explore Ensemble at the Royal College of Music (2016), and in Berio's O King with the Bristol Ensemble at Bristol's Elektrostatic festival (2012). She was Irma in Tom Phillips's opera IRMA with Apartment House directed by Netia Jones (South London Gallery, 2017), and has premiered roles in operas by Anton Lukoszevieze, Kate Whitley & Joe Snape, and Joel Rust. She also sang in artist Laure Prouvost's They Are Waiting For You during the Performatik festival at Brussels's Kaaitheater (2019).
Her solo voice can be heard on records by the likes of Jon Hopkins and Hayden Thorpe, as well as in films How To Talk To Girls at Parties (dir. John Cameron Mitchell, music by Nico Muhly) and Nome di donna (dir. Marco Tullio Giordana, music by Dario Marianelli).
As an ensemble singer, Josephine regularly performs with UK leading choirs including Tenebrae, The Tallis Scholars, EXAUDI, Philharmonia Voices and Britten Sinfonia Voices. With the London Contemporary Orchestra, she has sung on Radiohead's latest album A Moon Shaped Pool as well as on Thom Yorke's score for Luca Guadagnino's 2018 film Suspiria and his album ANIMA. She is also a founding member of the experimental vocal ensemble SHARDS (Erased Tapes).
Josephine was a member of the Maîtrise de Radio France and a choral scholar at Clare College, Cambridge.