Jethro Tull are a British rock band formed in Blackpool, Lancashire in 1967. Initially playing blues rock and jazz fusion, the band later developed their sound to incorporate elements of hard rock and folk to forge a progressive rock signature. The band is led by vocalist/flautist/guitarist Ian Anderson, and has featured a revolving door of lineups through the years including significant members such as longtime guitarist Martin Barre, keyboardists John Evans, Dee Palmer and Peter-John Vettese, drummers Clive Bunker, Barrie "Barriemore" Barlow and Doane Perry, and bassists Glenn Cornick, Jeffrey Hammond, John Glascock, and Dave Pegg.After achieving moderate recognition performing in the London club scene, the band released their debut album This Was in 1968. After a lineup change which saw original guitarist Mick Abrahams replaced by Martin Barre, the band released the folk-tinged blues album Stand Up. Stand Up saw the band achieve their first commercial success, with the album reaching No. 1 in the UK, followed by regular tours of the UK and the US.