Evan Andrews, ‘Who Were the Luddites?’ History, 7 August 2015, .
20
‘The World’s 25 Highest-Paid Musicians’, Forbes .
21
‘Mrs Billington, as St Cecilia’, British Museum Collection, ; Chrystia Freeland, ‘What a Nineteenth-Century English Soprano Can Teach Us About the Income Gap’, Penguin Press Blog, 1 April 2013, .
