Michael Jackson's sanity is clearly a matter of debate, but only a fool would deny his talent and chart supremacy since leaving Motown. "Number Ones" is yet another collection featuring the usual lineup of his classic hits: "Billie Jean," "Don't Stop Til You Get Enough," "Beat It," "Rock With You," and so on. The tracklisting is presented in chronological order, starting with material from "Off the Wall," right up to the previously unreleased R. Kelly ballad "One More Chance" and a somewhat unnecessary live performance of "Ben." There isn't much for me to comment about the hits themselves, except to say that unless you've been living in a 25 year coma, you're already familiar with 90% of this album. But the problems with "Number Ones" are twofold: first, the tracklisting overlaps Jackson's previous hits album "HIStory." Do we really need yet another recycling of songs millions of us already have? Also, not all of the tracks on "Number Ones" topped the chart, such as the excellent "Smooth Criminal" and "Break of Dawn," a cut off 2001's "Invincible" that was never even released as a single. Is "Number Ones" a competent survey of Jackson's biggest hits? Yes, it is. But is it a necessary purchase? Not if you already own "HIStory." While listeners green to Jackson's work should pick this up, "Number Ones" brings almost nothing new to the table for those who already own his prior albums.