Jo started singing at school in various groups, including an a cappella/barbershop group which she lead herself. Whilst still at school she joined the Ionian Singers, recording several contemporary music albums. She was a member of the National Youth Choir of Great Britain from 2001 to 2006, serving as the soprano 1 section leader for four years. She has been a member of Laudibus (the National Youth Chamber Choir) since 2002. Joanna went on to study singing at the Guildhall School of Music and Drama in London and has sung with numerous professional ensembles as a session singer, singing everything from church services to film soundtracks, including 'The Chronicles of Narnia: The Lion, the Witch and the Wardrobe', 'War Horse', 'Arthur Christmas', 'Green Lantern', 'Prometheus' and 'Harry Potter and the Deathly Hallows parts 1 & 2'. She joined the Swingle Singers in 2006.