Whatever creative evolution Michael Jackson intended for himself inmiddle age, we will never actually know; his legacy now falls to theexecutors who hold his vast musical estate. One can understand,though, why the wizard went quiet after releasing his live album ofnew material, 2001`s respectable if ultimately underwhelming Invincible. A famously relentless perfectionist in the studio, he kept his post-Invincible recording sessions under wraps while peers like Prince and Mary remained relatively prolific.