For me they're:
Layne Staley - man in the box - Bb4
Ian gillan - child time - A5
Ted neeley - Gethsemane (1993) - G5 (most powerful one I've ever heard!)
Eddie Vedder - Love reign oer me (the who) - D5
James Labrie - Learning to live - F#5
Jeff Buckley - Grace - E5 - G5
And of course pretty much any high note from Maynard James Keenan, IMO he's got the most powerful upper forth octave notes I've ever heard
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