Claim: Mariah Carey has signature use of the highest register of the human understanding.
Evidence: Referred to as the `` songbird supreme '' by the Guinness World Records , she has a five-octave vocal range , power , melismatic style and signature use of the whistle register.
The whistle register -LRB- also called the flute register or whistle tone -RRB- is the highest register of the human voice , lying above the modal register and falsetto register.