Adelaide Anne Procter, ‘A Lost Chord’ (1858), set to music by Sir Arthur Sullivan as ‘The Lost Chord’ (1877).

Felix Mendelssohn, letter to Lea Mendelssohn-Bartholdy (24 June 1837), in Felix Mendelssohn-Bartholdy, Paul Mendelssohn-Bartholdy (ed.), Lady Grace Wallace (trans.), Letters of Felix Mendelssohn-Bartholdy from 1833 to 1847 (London: Longman Green, 1864), p. 113.