The PS 22 Chorus takes a break from rehearsals in Central Park for a group photo. Margo Adler/NPR hide caption

itoggle caption Margo Adler/NPR

John Lennon and Yoko Ono greet the press from the Presidential Suite of the Hilton Hotel in Amsterdam on March 25, 1969. Central Press/Getty Images hide caption

itoggle caption Central Press/Getty Images