Final answer:
The fool on the hill utilized the first overtone and the second overtone as harmonic modes.
Step-by-step explanation:
The fool on the hill utilized these two harmonic modes: the first overtone (or second harmonic) and the second overtone (or first harmonic).
Harmonics are all multiples of the fundamental frequency. The first overtone is actually the second harmonic.
Harmonics are all multiples of the fundamental frequency. The second overtone is actually the first harmonic.