If you go to Ignition4 and sort by date, you can get an idea. Most songs do not have the year coded, but for those that do, you can sort by date and go to page 3141 (as of now) to find the oldest song that has a year coded. There are probably much older songs, but I'm not sure how to figure that out without pulling all the songs and checking.
So I'm a really long way away from understanding metal and I don't chug at all, but still - had noisy fun. It didn't sound right at all until I turned a little overdrive up on my amp:
I realize final counts are not in yet, but the Rocksmith 2014 Championship spreadsheet did not pick up my entry for Kaiser Chiefs "Oh My God" score on Lead for 96.24 on page 2.
Not sure how many players are US based college students, but I know my son is in Finals week with the semester ending on Monday. If any of you folks are stressing through Finals, good luck! You got this.