Plot: The fourth in this series of Henry Wood Promenade Concerts recorded at the Royal Albert Hall, London features The National Youth Orchestra of Great Britain conducted by Charles Dutoit The programme includes: Roman Carnival Overture by Berlioz and Stravinsky's ballet score Petrushka in the original 1911 version and a short film shows some members of this young orchestra in rehearsal at their summer school at Ramsgate. Tonight's concert will be, for many, their first performance at the Proms