In the biggest chart no-brainer of the year, Eminem debuts at #1 with “Relapse”, which scans 608,000 units in it’s first week. It’s by far the biggest debut week of the year, although it’s the slowest start for an Eminem studio album since “The Slim Shady LP” debuted in spring 1999. Granted, the music industry was in a much different place then. To put things into perspective, if the year was to end today, “Relapse” would be 2009’s #9 album with only 6 days of sales. Em should easily enjoy a second frame at #1 with no major releases out this week (although his partner in controversy Marilyn Manson should enjoy a Top 5 debut), although his reign will come to an end when the new Dave Matthews Band album comes out 6/2.

Elsewhere on the albums charts, it’s a sea of debuts and “American Idol”-led jumps. The top 10 hosts 7 new albums. In addition to Eminem, there’s the latest hits collection from Kenny Chesney at #3, Method Man & Redman’s “Blackout 2” at #4, Dane Cook at #5, Busta Rhymes at #6, Tori Amos at #9 and newcomer Kate Voegele at #10.

A little further down on the charts, a couple of collections by this year’s American Idol champ and runner-up debut, and to no one’s surprise, Adam Lambert’s collection (#33, 16K) outduels Kris Allen’s (#50, 10K), although it looks like Kris has the edge when it comes to individual tracks.

The chart’s biggest gainers this week also relate back to the “Idol” finale. Rod Stewart’s “Definitive” collection is up nearly 400% to 10,000 units, landing at #52 on the chart after being off of it the previous week. You might remember that Rod the Bod performed a generally atrocious version of “Maggie May” on the show. David Cook also finds himself the beneficiary of some “Idol” goodwill. His self-titled debut is up 111% to land at #29 with 17K in sales.

On the other side of the coin, it’s bad news for Cam’ron and Paul Wall, as both rappers slide over 60% in sales in their albums’ respective second weeks. Killa Cam drops from 3-35, while Paul Wall plummets from 15-64. Yikes, folks. Might hip-hop be the genre suffering the most from illegal downloading? Or are people just reacting quicker to bad music?