What songs have made up your life's soundtrack? Which have captured your every mood and deepest sentiments? Pop music, like no other form of entertainment or art, is capable of articulating our feelings, desires, joy, and pain. In a few soul-grabbing minutes, artists from every genre--from Little Richard to Lou Reed, Willie Nelson to Wu-Tang Clan, Sly and the Family Stone to the Rolling Stones--can help us understand our place in our own lives. This...