Original: In most of Andes' towns "vamos a ir a la quena" (we will go to the quena) was a popular sentence to threaten little children, because the quena was made of bamboo, a hard material.
Simplified: In most of Andes' towns "vamos a ir a la quena" (we will go to the quena) was used to threaten little children, because the quena was made of bamboo, a hard material.