The Three Choirs Festival is the world's oldest and greatest Choral festival, and this year it will be held in Hereford Cathedral from 21-27 July. The Philharmonia continues their three year residency at the festival and to celebrate we talk to those involved in making it happen. Highlights at this year's festival include Julian Lloyd Webber playing Delius's Cello Concerto, Joseph Phibbs's new composition Rivers to the Sea and a rare performance of Dyson's Pilgrim's Progress.