The ethereal voice of Alessandro Moreschi, the last classically trained castrato, singing Ave Maria.
I've always maintained that was what made Michael Jackson so weird..I think his dad had him fixed before his voice changed, so they wouldn't lose the "golden goose."
The trauma of that messed him up mentally and made him into a perpetual child...not to mention sexually confused...but it's just a theory...
Occam’s razor would posit that Michael was a common birth defect.
According to March of Dimes, about 1 in 135 live births has some genital or urinary tract birth defect, though most are minor. There are also some childhood diseases that might accomplish the same thing.