In March 1967 the Gibb brothers worked with Billy J. Kramer recording "Town of Tuxley Toymaker, Part 1". Around the same time, Colin Petersen and Vince Melouney joined the Bee Gees. In the middle of 1967 "Bee Gees' 1st" was released. The album was praised by the critics who compared it to the Beatles' "Sgt. Pepper's Lonely Hearts Club Band" which was released weeks earlier. AllMusic's Bruce Eder wrote that Gibb's Mellotron on "Every Christian Lion Hearted Man Will Show You" 'was close in the spirit of the Moody Blues and was opened by a Gregorian chant.' The band's first number 1 single in the UK, "Massachusetts" was released in September 1967. In early 1968, the "Horizontal" was released. In August 1968 the Marbles released their first and only successful hit "Only One Woman" a song co-written by Gibb. In the middle of 1968, the band's third international LP "Idea" included the song "Kitty Can", which features Gibb's high harmony vocal, with Barry Gibb singing low harmony. In early 1969, they released "Odessa", which features Gibb's solo vocals on "Suddenly" and "I Laugh in Your Face". On 19 March 1969, the same day that Robin Gibb announced his plans as a solo artist, Gibb and his bandmates recorded and later released "Tomorrow Tomorrow".