Answer:
Pythagoras set about conducting acoustical experiments after hearing the INTERVALS created by hammers in a blacksmith shop.
Step-by-step explanation:
According to the myth, one day, Pythagoras heard the intervals of sound made by the hammers in a blacksmith shop. He heard the dissonance and assonance made by the hammer on the metals, and thus began studies on it. The results of his studies became the foundation of what today we call "musical tuning".