1- Hayley Williams
2- Grimes
3- Ariana Grande
4- Ella Henderson
5- Tori Kelly
6- Pentatonix
7- Fifth Harmony
8- Kelly Clarkson
9- Mariah Carey, duh.
10-
11-
The shade of it all is that Whitney Houston didn't have a whistle register so they got that part of the article wrong. It was nice seeing though... Christina Aguilera, Jojo, Nicole Scherzinger, Ana Cristina and Leona Lewis
1. Britney Spears
2. Britney
4. Britney Jean Spears
5. Mona Lisa
5. Sister of Jamie Lynn Spears
6. Neyde
7. Britney
8. Oops!... I Did Britney Again
9. Princess of Pop
10. She's a Mom Now, Britney Spears
11. Britney One More Time
1- Hayley Williams
2- Grimes
3- Ariana Grande
4- Ella Henderson
5- Tori Kelly
6- Pentatonix
7- Fifth Harmony
8- Kelly Clarkson
9- Mariah Carey, duh.
10-
11-
They list 3 people in Fifth Harmony that can whistle well.
1. Britney Spears
2. Britney
4. Britney Jean Spears
5. Mona Lisa
5. Sister of Jamie Lynn Spears
6. Neyde
7. Britney
8. Oops!... I Did Britney Again
9. Princess of Pop
10. She's a Mom Now, Britney Spears
11. Britney One More Time
But mariah can not only reach whistle she can sing in it, I believe she's the only singer that can do that. For example in Emotions she does that or in fly like a bird (thank you jesus). So she can both control it and sing in it and has(or had) by far the strongest one.