Recently at the Golden Globes, Jim Carrey took to the stage to present the award for Best Motion Picture - Musical or Comedy. Though his short, humorous speech got a lot of people laughing, I don't doubt that the poignancy of his words also got a lot of people thinking.

Over the course of her career, Madonna has demonstrated an incredible commitment to reinvention, keeping herself relevant under the critical eye that accompanies the culture of constant change in the world of music and art.