It is the nature of the human voice for evolutionary reasons. That's why you can instantly recognize your mom's voice even over a bad phone line. In less than a second .

Mercury sang in falsetto with a lot of vibrato. It's hardly specific to him. His vibrato and breath control techniques come from operatic bel canto style. The falsetto from rock.

All voices produce subharmonics even when speaking. The parallel to throat singing is spurious. Mercury did not control a bi/multi-phonic melodic line the way a throat singer does. and any well trained singer can sound like Mercury.

One of the greatest voices of our time - very disappointed the movie about his life has never been able to get off the ground

when I'd play his records as a teenager. She loved classical,his voice blew her away!

Thanks for posting.

Did you ever hear him sing "Barcelona"? He sings with Monserrat Caballe, an opera singer. I'd heard so many other pop singers sing duets with opera singers and they always come off poorly in comparison. Not Freddie, he holds his own and their voices sound great together.