Ivan Hewett explores music by David Sawer, Robin Walker, Stephen Elcock and Emily Howard with the composers. Plus a look at small-scale music theatre in the UK, from 1945 until today. Stephen Elcock: Hammering Robin Walker: The Stone King David Sawer: the greatest happiness principle David Sawer: Piano Concerto Emily Howard: Magnetite Rolf Hind, piano BBC Philharmonic James MacMillan, conductor.