The Material Girl's videos are among the most controversial and provocative ever made, and her image is a constant evolution of art and style. Madonna has compiled her favorite 14 videos from the 1990s, including "Bad Girl" and "Secret." Also here are "Human Nature," "Ray of Light," "The Power of Goodbye" and "Nothing Really Matters," plus clips of "Fever," "Frozen" and "Beautiful Stranger" (from Austin Powers: The Spy Who Shagged Me).