Jonny Greenwood on BBC

The National Youth Orchestra of Wales rehearse a Jonny Greenwood piece for the Proms. Much of the time the conductor simply sweeps an arm over the players, and each starts a note as it passes overhead, so the sound runs on. One player says it means almost ignoring everyone around you, something new to them. Another, a Radiohead fan used to Greenwood's guitars and electronics, calls it an honour to play his music and is fascinated to hear what he can do with an orchestra.