Growing up in the icy isolation of Hibbing, Minn., Dylan, who was still Robert Allen Zimmerman then, found comfort in the country, blues, and early rock 'n' roll that he heard at night on a Louisiana radio station whose signal came in strong and clear.

In the role of Ziggy Stardust, Bowie seemed in 1972 like a strange alien creature, not so much coming from another planet as from a future age. His purpose: to warn us about a dangerous society where values were to be turned inside out.

The greatest impact of 'We Are the World' seems to have been the video, which lets us see the singers take their turns at the microphone without any sense of star ego.

It's important to realize that everybody who went into country music, and most everybody who went into rock and roll in the '50s, they had no more goal than a hit on the jukebox. Johnny Cash, from the very beginning, had a goal that he wanted to make music that lifted people's spirits.