I would like to sincerely apologise - I have gotten a lot of notes wrong on vocal ranges for singers. I have looked through all your comments - be it through comments or email or tweets, I would give all the singers another listen before reediting the singers' vocal ranges again.
If you would have noticed I took away a lot of posts down from my site too because the reviews are too biased and unprofessional, and I wish to start afresh with new posts and song reviews.
I apologise for the inconvenience caused.
Update: I have updated ALL of the singer's vocal ranges and will keep on adding new posts professionally from now on.