English progressive rock band founded in 1987 by Steven Wilson in Hemel Hempstead, Hertfordshire, U.K. Originally a pseudonym for Wilson's solo recordings, in 1993 the project mutated into a full band with the inclusion of Colin Edwin, Chris Maitland and Richard Barbieri. Maitland was replaced by Gavin Harrison in 2002 and the line-up remained the same until 2010, when the band went on hiatus.

On November 1st 2021 the band officially returned as a three-piece line-up, comprising Wilson, Barbieri and Harrison, with the new single release Harridan. The band's eleventh studio album [m=2683640], their first in thirteen years, was released on June 24th 2022.

Line-up
Steven Wilson - vocals, guitar, bass, keyboards (1987–2010; 2021–present)
Richard Barbieri - keyboards, synthesizers (1993–2010; 2021–present)
Gavin Harrison - drums, percussion (2002–2010; 2021–present)

Former members
Chris Maitland - drums (1993–2002)
Colin Edwin - bass (1993–2010)

Touring members
Randy McStine - guitar, backing vocals (2022–present)
Nathan Navarro - bass (2022–present)
John Wesley - guitar, backing vocals (2002–2010)