The choral music of Hilary Campbell has been performed in the United States, Spain, Poland, Lithuania, France, Sweden, Germany and Holland, as well as throughout the United Kingdom, by professional and amateur ensembles alike including The BBC Singers, The BBC Symphony Chorus, The Polish National Chamber Choir, Vilnius Municipal Choir, The Choir of Trinity College, Cambridge, The Royal Academy of Music Chamber Choir, The Ebor Singers, Leeds Cathedral Choir, Cheltenham Bach Choir, Harvard Memorial Choir, Wells Cathedral Choir, Culemborg Chapel Choir, The National Youth Choir of Great Britain, and The Choral Scholars of St Martin in the Fields. Recent performances include venues such as Neresheim Abbey, St Johns, Smith Square, The Royal Palace in Madrid, St Martin in the Fields, York Minster, Leeds Cathedral, Old Royal Naval College, Trinity College, Cambridge, and Wells Cathedral.
As well as original compositions, Hilary also works as an arranger. A number of her arrangements feature on a recording of Christmas carols released by Union Square Music, and her arrangement of the National Anthem was performed on ITV1 and at the Wimbledon New Theatre for the 60th birthday of the Prince of Wales. Her arrangements of hymn tunes are broadcast on Radio 4, she wrote an arrangement of The Twelve Days of Christmas for HBO, and she frequently receives commissions from the London Gay Men’s Chorus. Additionally, she arranges pop and jazz hits for her own ensemble, The Blossom Street Singers.