John Lennon. Unfinished Music #2: Life With The Lions. Baby's Heartbeat. ジョンレノン. 未完成の音楽#2:ライオンと生活. 赤ちゃんのハートビート.
...correction. It was not the heartbeat of Sean Lennon, it was a previous baby that Yoko miscarried. Sean was born in 1975 this baby was 1970.
...