Imagine is the second studio album by English musician John Lennon, released on 9 September 1971 by Apple Records. Co-produced by Lennon, his wife Yoko Ono and Phil Spector, the albums lush sound contrasts the basic, small-group arrangements of his first album, John Lennon/Plastic Ono Band (1970), while the opening title track is widely considered to be his signature song. The Ultimate Collection, a six-disc box set containing previously unreleased demos, rare studio outtakes, evolution documentaries for each track, and isolated track elements along with surround mixes.