I believe every pop girl has unique artistic traits and I like almost every pop girls.
Miley: Unique raspy voice
Selena: Sweet & mature and fluffy voice
Xtina: Stellar tone
Mariah: Comforting tone like the warmth of a fire after a long day in the cold and Whistle notes
Kelly: Sincerity and Powerful Voice
Beyoncé : Rap-singing/staccato singing, relies on rhythm instead of (just) melody
A unique but influential style.
Bey is also known for her precise and complex riffs/runs, piercing upper belts, velvety lower register, powerful middle register, strong vibrato and growls.