"Imagine" is a song written and performed by English musician John Lennon. It was released as a single from his album Imagine in 1971, and was released as a single in the United Kingdom in 1975 in conjunction with the album Shaved Fish. It was inspired by a poem from Yoko Ono's 1964 book Grapefruit.

The song received a Grammy Hall of Fame Award and is in the Rock and Roll Hall of Fame's 500 Songs that Shaped Rock and Roll; it was ranked the 3rd greatest song of all time by Rolling Stone in its "The 500 Greatest Songs of All Time".

The song's central theme was inspired by "Cloud Piece", a three-line instructional poem that appeared in Ono's 1964 book Grapefruit. The words were reproduced on the back cover of the Imagine album.

In a 1980 interview with David Sheff for Playboy magazine, Lennon commented on the message of "Imagine":

Ono indicated that the lyrical content of "Imagine" was "just what John believed—that we are all one country, one world, one people. He wanted to get that idea out." In addition, the content of "Imagine" was inspiration for the concept of Nutopia: The Country of Peace, created in 1973. Lennon included a symbolically mute "anthem" to this country on his album Mind Games. The inspiration for Ono's Imagine Peace Tower in Iceland came from words in the second verse: "Imagine all the people living life in peace."

John Winston Ono Lennon, MBE (9 October 1940 – 8 December 1980) was an English musician and singer-songwriter who rose to worldwide fame as one of the founder members of The Beatles, one of the most commercially successful and critically acclaimed acts in the history of popular music. Together with Paul McCartney, he formed one of the most celebrated songwriting partnerships of the 20th century.

Born and raised in Liverpool, Lennon became involved as a teenager in the skiffle craze; his first band, The Quarrymen, evolved into The Beatles in 1960. As the group disintegrated towards the end of the decade, Lennon embarked on a solo career that produced the critically acclaimed albums John Lennon/Plastic Ono Band and Imagine, and iconic songs such as "Give Peace a Chance" and "Imagine". After his marriage to Yoko Ono in 1969, he changed his name to John Ono Lennon. Lennon disengaged himself from the music business in 1975 to devote time to raising his infant son Sean, but re-emerged with Ono in 1980 with the new album Double Fantasy. He was murdered three weeks after its release.

Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒʌrməˈnɑːtə/ STE-fə-nee jurr-mə-NAH-tə; born March 28, 1986), known by her stage name Lady Gaga, is an American singer and songwriter. Born and raised in New York City, she primarily studied at the Convent of the Sacred Heart and briefly attended New York University's Tisch School of the Arts before withdrawing to focus on her musical career. She began performing in the rock music scene of Manhattan's Lower East Side, and was signed with Streamline Records by the end of 2007. During her employment as a songwriter for the record company, her vocal abilities captured the attention of recording artist Akon, who signed her to his label Kon Live Distribution.

Lady Gaga came to prominence as a recording artist following the release of her debut album The Fame (2008), which was a critical and commercial success that topped charts around the world and included the international number-one singles "Just Dance" and "Poker Face". After embarking on the The Fame Ball Tour, she followed the album with The Fame Monster (2009), which spawned the worldwide hit singles "Bad Romance", "Telephone" and "Alejandro". The album's success allowed her to embark on the eighteen-month long Monster Ball Tour, which later became one of the highest-grossing concert tours of all time. Her most recent album Born This Way (2011) topped the charts of most major markets and generated more international chart-topping singles, including "Born This Way", "Judas" and "The Edge of Glory". Besides her musical career, she involves herself with humanitarian causes and LGBT activism.