Every kid who has ever spent Friday night at a concert or a dance, or been mesmerized by the light of a jukebox, has his or her own Top 100. And it's safe to say that no two Top 100s are alike. The fun is in the fighting. What do you mean Jimi's not No. 1? Hey, where's Britney? Of LIFE's Top 100 we can say only this for certain: They rocked our world. We're betting a lot of them rocked yours. 1. ELVIS PRESLEY In the 20th century, only a few individuals in the world of popular music were...