Johnson has composed mostly orchestral music (such as
Aurora Borealis for large orchestra, 2009), and chamber music. There are four string quartets, including No. 2,
Surrender Him the Apocolyptic Chrysalis, premiered at the
Montepulciano Festival, Italy in 1999, and No. 4 (2012), in which each of the four movements are dedicated to four artists:
Jackson Pollock,
George Grosz,
Dora Carrington and
Tracey Emin. ==Honours==