You can't really stretch your natural range, but you can learn a completely different technique to do it. Trouble is, usually one cannot retain two different styles of singing intact for a long period of time.
I'm naturally a bass but singing metal and such for over two decades I've developed an entirely different way to do it and can get real high now and use up to two octaves. But my natural voice is nigh gone, can't go as low any more and it's kinda broken and hoarse when I sing low.
Most people know how to sing in falsetto, and the usual high going technique I use too is very similar to that, but kind of halfway falsetto where you sort of sing falsetto in the throat but back it up like normal and it becomes different. A bit dirty a sound and that's why it's a favorite of many metal and rock singers from acdc to iron maiden.
It can be found basically by sing ing falsetto quietly, keeping a note and while keeping it, try to change your breathing and lower vocal production into normal and loud. At first it probably causes adolescent sounding yelps- that Also happens when you tire also later on - and it may hurt after a while as it is kind of a destructive way of singing- but once you figure it out and use it much, it gets easier and you can do it actually with less fatigue than normal singing. And the more you use it the more you extend your range.
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Dee
"When life's a biatch, be a horny dog"
Amps: Marshall JVM 410H w/ Plexi Cap mod, Choke Mod & Negative Feedback Removal mod, 4x12", Behringer GMX110, Amplitube 3/StealthPedal
Half a dozen custom built/bastardized guitars all with EMG's, mostly 85's, Ibanez Artwood acoustic & Yamaha SGR bass, Epiphone Prophecy SG, Vox Wah, Pitchblack tuner plus assorted pedals, rack gear etc. for home studio use.