Horizontal is the fourth studio album by the Bee Gees, and their second album to receive an international release. The LP was released in early 1968, and included the international hit singles "Massachusetts" and "World". On 5 February 2007, Reprise Records reissued Horizontal with both stereo and mono mixes on one disc and a bonus disc of unreleased songs, non-album tracks, and alternate takes. The album was released in Polydor in many countries and on Atco only in the US and Canada. "And the Sun Will Shine" (backed by "Really and Sincerely") was released as a single only in France. The influences displayed on the album range from the Beatles to baroque pop. Background Around July 1967, the Gibb brothers sang backup vocals on Johnny Young's cover version of "Craise Finton Kirk Royal Academy of Arts" from Bee Gees' 1st, released as a single the following month. Also in July 1967, the Gibb brothers sang backup vocals on Oscar's cover version of "Holiday", with an orchestral arrangement by Bill Shepherd. Around July or August, Barry and Robin wrote "Cowman, Milk Your Cow", which was recorded by Adam Faith, with the Gibb brothers on background vocals, Russ Ballard and Pete Salt on guitars (though one source would suggest the latter was in fact Fleetwood Mac's Peter Green), Milt Rogan on bass and Bob Henrit on drums. Recording The Bee Gees began their first studio session for Horizontal on 17 July 1967 just three months after the last session for Bee Gees' 1st and three days after that album's release. The earliest session for Horizontal was really just a demo date to tape rough versions of the brothers' new songs. Venturing to Denmark Street (known as London's Tin Pan Alley), the Bee Gees booked Central Sound for 17 July, quickly cutting several tracks. They started to record the songs for this album on 17 July. The songs recorded on that day were "Ring My Bell", "And the Sun Will Shine" and "Day Time Girl". On 25 July, they re-recorded "And the Sun Will Shine" but it was rejected, and instead more work was done later on the first version. On 30 July, they recorded "Birdie Told Me", "Ring My Bell", "All So Lonely!" (written by Colin Petersen or Vince Melouney), "Barker of the UFO" and "Harry Braff". On 31 August, they recorded "Vince's Number", written by the brothers for guitarist Vince Melouney