Porcupine Tree is a British progressive rock band formed in Hemel Hempstead, Hertfordshire, United Kingdom in 1987. During the course of the band's history, it has at times incorporated psychedelic rock, alternative, ambient, electronic, and, most recently, metal and post-rock into its unique style of progressive rock. Since 2010, mainstay Steven Wilson has concentrated on his solo work. On November 1st, 2021, the band announced a new album and tour in the formation Gavin Harrison, Steven Wilson, and Richard Barbieri (without Colin Edwin).