The source is a comprehensive biographical entry on musician and activist John Lennon, structured chronologically from his early years through his revolutionary tenure with The Beatles and his solo career up to his murder in 1980. The text extensively details his professional endeavors, covering his influential songwriting partnership with Paul McCartney and his experimental albums and political collaborations with Yoko Ono. Attention is also paid to his complex personal relationships, including his marriages and his often-strained connection with his sons, Julian and Sean. The overview further addresses his notable role as a peace activist, detailing the challenges he faced, such as the persistent deportation attempts by the Nixon administration. Finally, the so ...