Lester Square is the former lead guitarist for The Monochrome Set. He joined the first incarnation of Adam and the Ants as lead guitarist, after meeting Adam while studying at Hornsey College of Art, writing Ants staples "Fall In" and "Fat Fun" during this period. He left in 1978 to form The Monochrome Set with singer-songwriter Bid, a band cited as "a major influence on the Smiths, Franz Ferdinand, Orange Juice, Fire Engines and a whole host of UK indie and post punk bands." He has also briefly played guitar with The Invisible (1985–1987), ...And the Native Hipsters, and Jesus Couldn't Drum.

The Monochrome Set are an English post-punk/new wave band, originally formed in London in January 1978. The most recent line-up consists of Bid, Andy Warren, Athen Ayren and Stephen Gilchrist.