Back in the day, it was a pretty popular tactic to play some type of instrument during war times. Either for organization or to scare the other guys and bring their spirits down....
Holy crap though man, the Aztecs was pretty insane. It's like you [b]knew[/b] you were fûcked if you heard this.
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that's probably one of the most badass war tactics i've ever seen. that would be terrifying to hear in the dead of night with your fires dwindling