Art Dudley (Stereophile Reviewer) told the best sound he has heard was the sound of his baby when born in hospital.
"I heard a sound that will stay with me until my last day on Earth: the
sound of my newborn daughter cooing, which was the sweetest thing ever.Remarkably or not, I heard some quality in
her voice that I continue to recognize in every word my daughter has
spoken to me in the days since. In that sense, the good lord God has
given me cause to smile many times a day, for reasons that are generally
unapparent to everyone else. Which is to say: Life is good.
Read more at https://www.stereophile.com/artdudleylistening/706listening/index.html#Vwd1dEOCQGSq2Msx.99"