The issue of OXM is unpublished, but the scan shows the releases as follows:
Week of March 4: Thrash Pack
Blinded By Fear - At The Gates
Thrasher - Evile
Shadow World - Haunted
Week of March 11:
Shooting Star - Bad Company *Cover*
Simple Man - Lynyrd Skynyrd
Message In A Bottle - Police
Week of March 18: Nine Inch Nails Pack
March Of The Pigs
The Collector
The Perfect Drug
Week of Mar. 25: Metal Pack
Wrathchild - Ironmaiden *Cover*
Supernaut - Black Sabbath *Cover*
Fuel - Metallica
Not too bad; I definitley would/will enjoy the Nine Inch Nails Pack, as well as a few select songs from the other weeks. Harmonix certainly has a hard time keeping their DLC under wraps.