that's true, but there is a science, and you can really fuck up your voice if you don't know what you're doing.

check out this site or book:

www.secretsofsinging.com

you can get this type of crap if you're not careful:

Laryngitis
Polyps
Nodules
Contact ulcers
Calluses

that stuff can affect your voice for the rest of your life.

__________________