The widest vocal range of any human is 10 octaves ranging from G/G#-5 to G/G#5 (0.7973 Hz - 807.3 Hz), achieved by Tim Storms (USA) at Citywalk Studios in Branson, Missouri, USA, on 1 August 2008.
http://www.guinnessworldrecords.com/records-3000/greatest-vocal-range,-male/
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