First, I must say good luck on being a Rush cover band. If you can successfully pull that off I will, and I promise, to be your #1 fan. Second, To sing higher, sing in Falsetto or just tighten your throat. It seems like Geddy (you spelled his name wrong BTW) does that alot to sing like he does, especially now in his older days...
GOOD LUCK!!
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Poetry by Envy the Sin
http://storywrite.com/story/by/This20%Means20%War20%