John Lennon. Unfinished Music #2: Life With The Lions. Baby's Heartbeat. John Lennon. Nedokončená hudba # 2: Život se lvy. Dětská Heartbeat.
...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.
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