Question: Which singer of the Bee Gees sung a middle part of a song in which the majority was sung by Barry Gibb?

Passages:
Robin Hugh Gibb (22 December 1949 – 20 May 2012) was a singer, songwriter and record producer, who gained worldwide fame as a member of the pop group the Bee Gees, with his brothers Barry and Maurice Gibb, his fraternal twin.  Robin Gibb also had his own successful solo career. "I Was a Lover, a Leader of Men" is a single released in November 1965, recorded by the Bee Gees, written by Barry Gibb.  The song was backed with "And the Children Laughing".  However, it was released in the Philippines in January 1966.  It is also the first track of the Bee Gees' first album, The Bee Gees Sing and Play 14 Barry Gibb Songs.  This song won Barry a song-writing award. "You Wouldn't Know" is a song written by Barry Gibb which was recorded by the Bee Gees and released as the B-side of their version of "Every Day I Have to Cry" and later included on the album "The Bee Gees Sing and Play 14 Barry Gibb Songs" (1965).  The album of the same name was released in Europe by Tring Records and features the Bee Gees songs from 1963-1966. "Tomorrow Tomorrow" is a song by the Bee Gees written by Barry and Maurice Gibb.  The song was originally intended to be recorded by Joe Cocker.  It was the first Bee Gees single released after Robin Gibb had quit the group which was now down to a trio featuring Barry Gibb, Maurice Gibb, and drummer Colin Petersen. The Kid's No Good was to have been Barry Gibb's debut solo album following his departure from the Bee Gees in December 1969.  There was no official title given to the album at the time.  The line "the kid's no good", which the album is commonly titled on several bootleg releases, is also featured in the Bee Gees song "Come Home Johnny Bridie" on the 1973 album "Life in a Tin Can".  The album features orchestral arrangements by Bill Shepherd who performed the same role for the Bee Gees from 1965 to 1972 (Robin and Maurice Gibb's solo recordings were done with different arrangers). "I Want Home" is a song by the English rock band Bee Gees, written by Barry Gibb and released as a single in Australia in early 1966, backed with "Cherry Red".  Their last single on Leedon had not been a hit, so the credit "Barry Gibb and the Bee Gees" used on the last several discs now reverted to simply "Bee Gees".  Neither song appeared on any Bee Gees album until the 1967 compilation album, "Turn Around, Look At Us", but both were featured on "Brilliant From Birth" the 1998 anthology of the group's Australian recordings. "I Laugh in Your Face" is a ballad performed by the Bee Gees, written by Barry, Robin & Maurice Gibb and released in March 1969 on the album "Odessa".  Most of the vocal solos are performed by Barry Gibb except for a little part in the middle of the song sung by Robin Gibb. The Bee Gees Sing and Play 14 Barry Gibb Songs is the debut studio album by the English pop band the Bee Gees.  (1967's "Bee Gees' 1st" was the "international" debut album).  Released under the artist title "Barry Gibb & the Bee Gee's" "[sic]", it was released in November 1965 on the Australian Leedon label.  It is a compilation of most of the Gibb brothers' singles that had been released over the previous three years in Australia, which accounts for the many different styles of music on it. "Timber!"  is a song recorded by the Bee Gees, written by Barry Gibb.  The song was released in Australia as their second single in July 1963, backed with "Take Hold of That Star".  It was later included on the group's first album "The Bee Gees Sing and Play 14 Barry Gibb Songs". Cucumber Castle is the seventh studio album by the Bee Gees, released in April 1970.  It was produced by Barry Gibb, Maurice Gibb, and Robert Stigwood.  It consists of songs from their television special of the same name, which was named after a song on their 1967 album "Bee Gees' 1st".  "Cucumber Castle" was the only Bee Gees album not to feature any recorded contributions from Robin Gibb, as he had left the group before the album was recorded.  (He did receive co-composer credit on one track, which was written before his departure.)

Supporting sentences:
 Most of the vocal solos are performed by Barry Gibb except for a little part in the middle of the song sung by Robin Gibb. Robin Hugh Gibb (22 December 1949 – 20 May 2012) was a singer, songwriter and record producer, who gained worldwide fame as a member of the pop group the Bee Gees, with his brothers Barry and Maurice Gibb, his fraternal twin.