McCartney was out of the country at the time and did not contribute to the track, and was reportedly unhappy that it was included. He had led similar tape experiments such as "Carnival of Light" in January 1967. The track has attracted both interest and disapproval from fans and critics over the years. Lennon wrote "Good Night" as a lullaby for his son Julian, and wanted Starr to sing it. The early takes featured just Lennon on acoustic guitar and Starr singing. Martin scored an orchestral and choral arrangement that replaced the guitar in the final mix, and also played the celesta. Singles "Hey Jude" was recorded at the end of July 1968 during the sessions for The Beatles but was issued separately as a single nearly three months before the album's release. This was the first release on Apple Records and ultimately the band's most successful single in the US. The B-side, "Revolution", was a different version of the album's "Revolution 1". Lennon wanted the original version of "Revolution" to be released as a single, but the other three Beatles objected that it was too slow. Instead, the single featured a new, faster version, with heavily distorted guitar and an electric piano solo by Nicky Hopkins. The convention in the British music industry at the time was that singles and albums were distinct entities and should not duplicate songs. But although no singles were taken from The Beatles in Britain or America, "Ob-La-Di, Ob-La-Da" backed with "While My Guitar Gently Weeps" was released in other markets. The single was a commercial success in Australia (where it spent five weeks at number one on the Go-Set chart), Japan, Austria and Switzerland. Unreleased material Some songs the Beatles were working on individually during this period were revisited for inclusion on their subsequent albums, while others were released on the band members' solo albums. According to the bootlegged album of the demos made at Kinfauns, the latter of these two categories includes Lennon's "Look at Me" and "Child of Nature" (eventually reworked as "Jealous Guy"); McCartney's "Junk"; and Harrison's "Not Guilty" and "Circles". In addition, Harrison gave "Sour Milk Sea" to the singer Jackie Lomax, whose recording, produced by Harrison, was released in August 1968 as Lomax's debut single on Apple Records. Lennon's "Mean Mr. Mustard" and "Polythene Pam" were used in the medley on Abbey Road the next year. The Lennon