Mariah Carey has signature use of the whistle register in her song "We Belong Together".
Mariah Carey . The album became the best-selling album in the US and the second best-seller worldwide in 2005 and produced `` We Belong Together , '' which became her most successful single of the 2000s , and was later named `` Song of the Decade '' by Billboard . 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 .