BBC Proms

The world's great orchestras have all visited the Proms over the years, and usually provide some of the highlights each season. Tonight's guests are the Los Angeles Philharmonic under their music director Esa-Pekka Salonen, who bring a work that was written for them, Lutoslawski's Fourth Symphony. The composer, who died earlier this year, conducted its UK premiere at last year's Proms.