Madness are a British pop/ska band from Camden Town, London, that formed in 1976. The band continue to perform with their most recognised lineup of seven members, although their lineup has varied slightly over the years. They were one of the most prominent bands of the late-1970s 2 Tone ska revival.
Madness achieved most of their success in the early to mid 1980s. Both Madness and UB40 spent 214 weeks on the UK singles charts over the course of the decade, holding the record for most weeks spent by a group in the 1980s UK singles charts. However, Madness achieved this in a shorter time period (1980–1986).
The core of the band formed as The Invaders in 1976, and included Mike Barson (Monsieur Barso) on keyboards and vocals, Chris Foreman (Chrissy Boy) on guitar and Lee Thompson (Kix) on saxophone and vocals. They later recruited John Hasler on drums and Cathal Smyth (better known as Chas Smash) on bass guitar. Later in the year, they were joined by lead vocalist "Dikron".