"Imagine" by John Lennon is performed in the original key of C major. Released in 1971 as the title track of his album "Imagine," the song is a poignant anthem for peace and unity. Written and performed by John Lennon, the former member of The Beatles, "Imagine" has become one of the most iconic and enduring songs of all time. An interesting fact is that Lennon was inspired to write the song after reading the book "Grapefruit" by Yoko Ono, his wife, which influenced the song's message of hope and envisioning a world without conflict or division. The melody features simple yet powerful piano chords and Lennon's emotive vocals, creating a timeless and universal appeal that continues to resonate with listeners around the world.