Great idea - Unfortunately for this, I cannot merely stick to 70s/80s rock but must further into the future, and deeper into the metals.
My View
Standing on the edge of the battle field, you and your 7 brothers are facing off against the evil Biebers, a verocious and vile bunch who have recently pillaged your home village.
Your family were slaughtered before your eyes - Lambs were burnt, women were raped, men were mutilated and after your 6 months training hard in the gargantuan and fear-inducing forests of "Amun NukRah" you are finally ready for battle.
As you scream charge, you and your brothers start charging down the hill. The wind is picking up now boy, the clouds are forming, the rain is hammering down, you feel the fire burn in the very depths of your soul! You raise your sword, send a fearfull battle cry and for your country and for your family, you take the vengeance much sought after!
*Note - the above paragraph all takes place from 1.50 to the end of the song*