How do you practice a concerto without an orchestra? Who controls a concerto - conductor or soloist? Are there any similarities between taking the role of soloist and sitting at the back as the anonymous orchestral pianist? Guests Stephen Hough, Lucy Parham and Ben Dawson paint a picture of solitary practice rooms, the pressure of not missing your cue, going into battle with an orchestra and the thrill of a Tchaikovsky piano concerto.