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This wasn't bad at all... but it sounded as though you were straining to get to those higher notes. I'd suggest doing one of two things - first, you can change the key signature of the songs. Try dropping it down two or three steps so you can get to those higher notes. Secondly, use your falsetto rather than your normal singing voice so you don't sound strained. Other than that though, this was pretty good. Well done!
Wonderful performance....