John Lennon continues to be commemorated on the 55th anniversary of 'Imagine' and the 86th anniversary of his birth, with renewed attention on his legacy, including reflections from Paul McCartney on their creative relationship and previously unreleased demos discussed by Giles Martin. Various retrospectives highlight Lennon's influence on music, from his personal struggles and creative process to his enduring impact on artists like U2 and Eric Clapton.