When we think of successful music entertainment groups of the past 60 years, the beatles almost always appear in the top 5! in the early days, the entertainment groups life cycle could have ended as so many other rock groups do-here today, gone tomorrow. the four musicians were definitely creative and passionate about their craft and genre of music. as the informal leader of the group, john lennon _____________ the others to make important compositional contributions. all four members had the opportunity to create musical compositions and receive copyright credit for their contributions?