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I recorded this song last night and tried to sing like an opera singer. I had to sing several lines, but I never got a sore throat afterwards and this I think is because I tried to resonate the bottom floor of the throat/neck. I think I made a good progress in this area because last time I tried singing I had a sever sore throat and my coughs lasted for a week or so.
http://www.youtube.com/watch?v=sth_dfm5PHM&feature=player_embedded
http://www.youtube.com/watch?v=sth_dfm5PHM&feature=player_embedded
A couple days ago, though, during my skype class, I was trying to show the difference between mouth pronunciation and throat pronunciation using Rrrrr sound. I did too much of mouth-based pronunciation, I think, and afterwards I felt a slight pain in my throat. This tells me that mouth-based pronunciation causes too much tension around/in the vocal cords.
If you try to say Rrr in the mouth, you will be sounding like A~~~~. You cannot get rid of the initial A sound. Try to imitate how a dog growls. That is R.