Luciano Tajoli or Claudio Villa？

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Luciano Tajoli or Claudio Villa？

1 – My friend said: "I think the first singer is Luciano Tajoli, and the second one is Claudio Villa."

2 – My response:

First of all, I want to thank this gentleman for his dedicated research.
https://www.youtube.com/watch?v=chSwOnZxBwc&t=66s
To distinguish whether the movie song "Piccola Santa" was sung by Claudio Villa or Luciano Tajoli is extremely difficult for the average listener.
We cannot rely on intuition — we need solid evidence.

I would be very happy to discuss this directly with you via Skype.
As for this question, I will leave it for my students and friends to reflect on.

When studying vocal music, ability is very important — but even more essential are wisdom and scientific methods.

So how can this piece of singing be distinguished?
Should we compare the sound waves of the two singers? Or is there another method?

My personal principle is always this: to complete the most intricate tasks with precision, using the least amount of time possible.

I hope you are able to find the correct answer — and what matters most is presenting a solid reasoning behind it.
Who is actually singing here? Who can explain it clearly?

I look forward to hearing your thoughts — although I have already come to my own conclusion.

Thank you for your comment.