The walking dead, a guitar cover.
The main character of The Walking Dead, Rick Grimes, tells his son how hostile the world can be. Maybe we all can learn something of his words. "Don't let your guard down" does not mean to be as hostile as the world or agressive and merciless, it means to work and get to be as prepaired as you can to face the unexpected instead of doing nothing and being absolutely paralized out of fear.
This is a guitar cover of the main theme of the The Walking Dead series composed by Bear McCreary.
Enjoy!