(I almost did not post this because, after reading all of your combined thoughts I concluded that my input may be a bit.....rough around the edges. However, these are truly some of the songs that came to mind first. So I just started typing my reply....but before I submitted it, I read through all of your replies......and now I feel like I just crashed a black-tie gathering of minds.
After further reflection, I decide to submit my reply. Afterall, in keeping with the illustrious tradition of this board, if you don't like it......you can Ram It! Bitches.

)
When you say "greatest songs of all time" and "rock" and "as a matter of insistence".....all in the same context.....it clouds the waters my friend. So I'll stick with "rock" and "as a matter of insistence".
As ass hell is breaking loose in 2012 and the planet is in turmoil, you will find the following on my Road Warriors last CD:
Children of the Grave (Black Sabbath 1971, Master of reality)
Snowblind (Black Sabbath 1972, Volume 4)
Battery (Metallica 1986, Master of Puppets)
Poor Twisted Me (Metallica 1996, Load)
Knock 'em Dead Kid (Motley Crue 1983, Shout the the Devil)
Run to the Hills (Iron Maiden 1982, The Number of the Beast)
Heavens on Fire (Kiss 1984, Animalize)
Copperhead Road (Steve Earle 1988, Copperhead Road)
Another One Bites the Dust (Queen 1980, The Game)
Holy Diver (Dio 1983, Holy Diver)
I'll stop here. I can post my entire end of days CD if you want, but mind you there will be about 90 songs (.mp3). These ten are the first to cross my mind and would not necessarily be written in the above order.
Why these songs? Because they all get my blood pumping! The louder they are played the better they sound. Also, they fill me with the urge to visit violence upon every living thing within eyesight. They bring back memories of running the streets chasing girls and smoking a-lot of weed. Fights. Guy-songs. Man-songs.
For the less psychopathic, these are pretty good workout songs.
So, with the ultimate tribute, if I do get snuffed-out on or after 2012......I do hope it is to the sound of one of these tunes.