A new track pack for Guitar Hero III is now available on Xbox Live Marketplace. Entitled the Modern Metal pack, the new DLC includes three new tracks from the Deftones, Avenged Sevenfold, and Thrice. As an added bonus, all three tracks are master tracks. The tracks, which will run you 500 MS Points, are as follows:Activision has also announced that a special pack is in the works for St. Patrick's Day later this month. The pack will include songs by the Celtic punk band Dropkick Murphys. The three (master) tracks that will be available on the pack are "Famous for Nothing," "(F)lannigan's Ball" and "Johnny, I Hardly Knew Ya." Best of all, the track pack will be free. Expect it to arrive (you guessed it) sometime before St. Patrick's Day.