Diary of a degenerate: mapping the music and the madness of Carlo Gesualdo

The Renaissance composer wrote hauntingly sublime music – and committed a grisly double murder before descending even further into psychosis. As a new stage work revisits his life, its director asks if art can be separated from artist

Carlo Gesualdo wrote some of the most darkly sublime music of the late Renaissance. He also savagely murdered his wife and her lover in their bed. Now be honest: which would you like to discuss first?

The art will always be secondary to the atrocity, however magnificent the madrigals and sacred music. Gesualdo, Prince of Venosa, had been cuckolded by the Duke of Andria in a long-running tryst that had become the scuttlebutt at court. The premeditated double murder of 1590 was a truly grisly affair, concluding in the public display of their mutilated bodies on the steps of the palazzo for several days.