Steven Tyler discusses The Beatles' fast evolution

 Steven Tyler on the fastest evolution in rock ‘n’ roll: “How great is that?” From fish, to monkeys, to walking, talking human beings; evolution is the ultimate example of development. The history of the world has been built and grown step by step like bricks, stacking one on top of the other, getting bigger, better and more advanced. The history of music has grown the same way, too, with each new band and album …