840 is a London-based experimental music concert series, founded in 2014 by the composers Alex Nikiporenko and Nicholas Peters. Committed to championing new pieces by composers that we believe in, each concert in the series focuses on a particular chamber instrumentation.

840 takes its name from Erik Satie's inscription in Vexations - "In order to play the theme 840 times in succession, it would be advisable to prepare oneself beforehand, and in the deepest silence, by serious immobilities."