The new documentary "One to One: John & Yoko" dives deep into the intertwined lives of John Lennon and Yoko Ono, showcasing the couple's groundbreaking performance from the early 1970s that defined an era of activism and artistic expression.Set to premiere on April 11, this film captures the essence of their only full-length concert, which raised critical funds for children facing mental challenges amidst the backdrop of the Vietnam War.