John! Paul! George! Ringo! With this week's release of "The Beatles: Rock Band" and the digitally remastered Beatles' catalog, The Beatles are once again on the tip of everyone's tongues. From their youthful, mop-top days, to the frenzied U.S. invasion and psychedelic trip to India, the Beatles' lasting impact on music as well as the world is undeniable. Take a look through 49 years of rarely seen photos of four chart-topping lads from Liverpool, whose music rocked -- and still rocks -- the hearts and ears of the world.