John Lennon didn't invent it rock and roll, nor did he embody it as toweringly as figures like Elvis Presley and Little Richard, but he did more than anyone else to shake it up, move it forward and instill it with a conscience. As the most daring and outspoken of the four Beatles, he helped shape the agenda of the Sixties—socially and politically, no less than musically. As a solo artist, he made music that alternately disturbed and soothed, provoked and sought community. As a human being, he served as an exemplar of honesty in his art and life. As Jann Wenner wrote in the foreword to a collection of writings entitled The Ballad of John and Yoko, "Of the many things that will be long remembered about John Lennon—his genius as a musician and singer, his wit and literary swiftness, his social intuition and leadership—among the most haunting was the stark, unembarrassed commitment of his life, his work and his undernourished frame to truth, to peace and to humanity."