More from the "Gab Four" as we continue our look at April 4, 1962 - The Beatles at the Stowe School.    George Harrison's guitar comes through loud and clear, but a bout with the cold or flu has limited what he can do with his voice.    Despite this issue, the band does their best and still finds a way to change the lives of the young men who will become the next generation of power brokers in the UK.