"Rain" is a song by the English rock band The Beatles, credited to Lennon/McCartney. It was first released in June 1966 as the B-side of the "Paperback Writer" single. Both songs were recorded during the sessions for Revolver but neither appears on that album.
Written primarily by John Lennon, "Rain" has been called The Beatles' finest B-side, especially notable for its heavy sonic presence and backwards vocals, both of which were a hint of things to come on Revolver, released two months later.
Recording began on 14 April 1966, in the same session as "Paperback Writer", and concluded on 16 April, with a series of overdubs before mixing on the same day. At that time, The Beatles were enthused about experimenting in the studio to achieve new sounds and effects. These experiments were showcased in their influential seventh album, Revolver. Geoff Emerick, who was the engineer for both sessions, described one technique he used to alter the sonic texture of the track by recording the backing track "faster than normal." After playing the tape normally, "the music had a radically different tonal quality. A similar technique was used to alter the tone of Lennon's lead vocal. It was recorded with the tape machine being slowed down, so making Lennon's voice sound higher when played back at normal speed. The last verse of "Rain" includes backwards vocals, which was one of the first uses of this technique on a record. The backwards vocals are Lennon singing the lyrics of the song: "When the sun shines," "Rain," and "If the rain comes, they run and hide their heads." Both Lennon and producer George Martin have claimed credit for the idea; Lennon said:
Three promotional films were made for the song "Rain". These videos, along with other Beatles videos at the time, sparked George Harrison to say during the Beatles Anthology, "So I suppose, in a way, we invented MTV."