Overview: ‘I think and feel in sounds,’ said Maurice Ravel. So, when he wrote his ballet Daphnis and Chloe, he created a sumptuous musical panorama in which you can hear every drop of dew, every flurry of birdsong and every ray of glittering light. Sounds thrilling? Now hear it performed by the ‘world’s greatest orchestra of teenagers’ – playing with an energy and joy that make even the Royal Albert Hall feel a bit on the small side. The National Youth Orchestra of Great Britain’s annual Prom is always a highlight of the season, and tonight its 150-plus players are working on a cinematic scale: Simone Dinnerstein performs Gershwin’s Rhapsody in Blue, and there’s a spectacular, specially commissioned opener from Hollywood legend Danny Elfman.