Marjorie Wallace, chief executive of mental health charity SANE, joins Humphrey Carpenter to explore claims that Edward Elgar was a manic depressive, reflecting on the spirit of loneliness and the struggles in his life which created moments of sublime music. The composer of The Dream of Gerontius and the Enigma Variations claimed his pet rabbit helped him write songs, and once asked a girl to catch notes for his next work in her butterfly net. With contributions from Elgar's biographer Jerrold Northrop-Moore