Sengoku Basara features prettied-up versions of some tough as nails dead dudes. The game is set against Japan's Warring States period during which Japanese people were beating the shit out of each other. But the game's aren't nearly as horrific (or smelly) as the history. So bring on the rock'n'roll soundtrack.
The newly released Sengoku Basara: Chronicle Heroes for the PSP features a Do As Infinity tune, dubbed "Chikai" (Oath), as the game's theme song.