In April 2007, Montreux appeared in Pegasus Opera Company's production of Delius' Koanga at Sadler's Wells Theatre to mark the 200th anniversary of the abolition of the slave trade in Britain.
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In 2008, Montreux was a member of the West End Chorus for Chess at the Royal Albert Hall, also starring Josh Groban, Idina Menzel, Adam Pascal, Marti Pellow and Kerry Ellis.
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