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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Azteks... Are those the same people that created that crazy temple for some god that would "reflect" the sound of a certain bird call if you clapped. (And I think would reflect the sound of the pitter-patter of rain when you walked up or down its stairs). Those people are crazy-smart. Yeah, probably screwed if you heard that coming for you.