Tarkus is the second studio album by English progressive rock band Emerson, Lake & Palmer, released on 14 June 1971 on Island Records. Following their debut tour across Europe during the second half of 1970, the group paused touring commitments in January 1971 to record a new album at Advision Studios in London. Greg Lake produced the album with Eddy Offord as engineer. Side one features the 20-minute conceptual title track written by Emerson, the opening of which created friction between Lake and himself that almost split the group, but Lake agreed to pursue it and contributed musical ideas for it and wrote the lyrics. Side two features a collection of unrelated tracks of different styles. The artwork was designed by William Neal. Tarkus went to number one on the UK Albums Chart, becoming the only album by the band to do so. It was a top 10 album worldwide, including the US, where it peaked at number 9. The album reached gold certification in the UK and US, the latter for 500,000 copies sold. It has been reissued and remastered several times, including a new stereo and 5.1 surround sound edition by Steven Wilson, with bonus and previously unreleased tracks from the original sessions, released in 2012. Background and recording After their debut live gigs in August 1970, the band toured across the UK and Europe for the rest of the year, during which their debut album, Emerson, Lake & Palmer, was released. While on tour, Emerson found that he and Palmer were exploring more complex rhythmic ideas. He took patterns that Palmer was playing on his practise drum pads and found that they complemented runs that he had developed on the piano, and used this as a basis for material on Tarkus. The group approached the album by having a centrepiece track in order to establish a concept, but a definite story or idea for it had not been discussed at this stage. The group paused touring commitments in December 1970 and set the following month aside to record. As with their debut, the band recorded at Advision Studios in London with Lake handling the production duties and Eddy Offord returning as engineer. Early into the sessions Emerson presented the basis of the title track to Lake and Palmer; Lake was less than enthusiastic with its direction and threatened to leave the group. A subsequent meeting amongst the