The top three songs (in my opinion) are:
1. Sweet child o mine by Guns n roses because it's a classic
2. Beast and the harlot by Avenged Sevenfold because it's a perfect heavy metal song
3. Six by All that remains (note is in bonus tracks section) Forget thunderhorse, this is the ultimate metal armageddon. I particularly like the slower bit in the middle, after the accoustic ends and the electric guitar enters.