"[2] The opera Jonah, with a libretto by Michael Irwin (author), was commissioned by the Canterbury Festival and first produced in Canterbury Cathedral in 1996; the dramatic cantata Gethsemane was premiered by Florilegium at the Spitalfields Festival in 1998; the Brunel (opera project),[3] featured on BBC Radio 4's Setting Brunel to Music[4] in October 2003.
[5] The cantata Hear our Voice (co-written with the British composer Jonathan Dove) was premiered in London, Nuremberg and Prague in 2006.
King's experimental cantata, Schoenberg in Hollywood (libretto by Alasdair Middleton), premiered in Guildhall School of Music and Drama's Milton Court concert hall in 2015.
Blue, a rhapsody for piano and chamber orchestra, was written in 2011 for the Savant pianist Derek Paravicini, with whom Matthew King had previously improvised on BBC Radio 4 in 2009.
King embarked on a series of increasingly political protest pieces, including Fix This (2012) for piano, violin, cello, electric guitar and two percussionists, first performed at the Royal Northern College of Music.
He composed a cycle of single movement piano sonatas, in the tradition of Scarlatti, but inspired by a musicians and topics including Hildegard of Bingen, Duke Ellington, Bernard Herrman, Italian Opera, Irish Folk Music, Morton Feldman, Derek Jarman and Bill Evans, among others.