The Esterhazy Singers directed by Esther Jones, which is based in the City of London, celebrates 40 years of performing inspirational choral musicwith a performance of Tallis's 'Spem in Alium ' for 40 voices.Plus, the premiere of a work by British composer Alexander Campkin and miniature masterpieces of English choral music featured on the choir's CD 'Jewels in the Crown'.