==Five-octave vocal range== 

 I see you have a history of working on the article Five-octave vocal range. I am looking at it from the project Wikipedia:Unreferenced articles where it is one of the longest  tagged articles that does not meet at least the barest minimum of verifiability. It has been tagged and completely without references since June 2006. It would be extremely helpful if you had some references you could add to the article to help support its verifiability and notability. Thanks for any help you can give.