Jethro Tull were a British rock group. Their music is characterised by the vocals, acoustic guitar, and flute playing of Ian Anderson, who led the band since its founding, and the guitar work of Martin Barre, who had been with the band since 1969, after he replaced original guitarist Mick Abrahams.Formed in Luton, Bedfordshire, in December 1967, initially playing experimental blues rock, they later incorporated elements of classical music, folk music, jazz, hard rock and art rock into their music.Jethro Tull have sold more than 60 million albums worldwide. They have been described by Rolling Stone as "one of the most commercially successful and eccentric progressive rock bands". The last works released as a group were in 2003, though Anderson would still continue to tour under the Jethro Tull name. In April 2014, Anderson stated that "Jethro Tull" as a band was no more, wanting to leave the legacy of the name as he continued his solo career.