71x54 - BBC Proms

Proms Extra continues to explore the Proms season as it passes the halfway mark. Katie Derham is joined by harpist Catrin Finch and singer Julian Ovenden, and the show turns the spotlight on the National Youth Orchestra of Great Britain and their performance of Thomas Ades's Polaris, John Wilson Orchestra's Oklahoma! and David Owen Norris returns with Chord of the Week.