Answer:
2
Explanation:
So "overtone" is an umbrella term, and there are two types of overtones: (1) "harmonic" overtones (which are integer multiples of the fundamental frequency) and (2) overtones that aren't integer multiples of the fundamental frequency (I'll call these disharmonious overtones)
The Mona Lisa is the most famous one. Although, there are others.
Mike Myers played multiple parts in Austin Powers!