a lot of famous pop singers are singing with a one octave vocal range. Ashlee Simpson is one that comes immediately to mind. You can train yourself to extend your vocal range to a certain degree with proper vocal instruction. Certain exercises and singing passages can be used to eventually extend your range a little bit, but your upper and lower limits of your range are pretty much fixed already by your body. No matter how many vocal lessons he took, someone with a deep husky voice like barry white would never be able to sing something real high and clean like sebastian bach in "18 and Life" (skid row) . Not that that's necessarily a bad thing, there's cool singers in every vocal range. You should just find a vocal teacher to help point out famous singers in your vocal range and start working on that stuff. Everyone has a unique vocal timbre and that's what makes singing such a special thing. You can't just use the same gear as another singer and cop a similar tone like you can with other instruments. Also, make sure not too sing the majority of your stuff in falsetto as you will do major damage to your throat. Falsetto is a cool effect if used in moderation, but if you are singing complete songs like that you are going to have a ton of problems down the line.
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