I first heard of it on this site. In one of the blogs there was a discussion of references to drinking your own urine in the Bible and other texts. One of the references was to an ancient text that stated that if you drink your own urine for 6 months in a mixture of honey, your voice will become melodious. The second place I read about it was on this site called Shirleys Wellness Cafe. There was a free e-book by an Indian doctor on UT. He stated that consistently drinking urine through your nose can give you a better voice. It seems as if it might have some validity. Below is the PDF link to the e book.