Aguilera's Spinto Soprano voice has been hailed as one of the best of all time. Her vocal abilities are frequently compared to that of Mariah Carey and Whitney Houston. In 2003, she placed at #5 (3rd for a female, behind Carey and Houston) on MTV's countdown of The 22 Greatest Voices in Music.

Vocal profile
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• Voice type: Spinto Coloratura Soprano
• Highest note: C7, B-b6
• Lowest note: C3, D3
• Vocal range: 4 octaves (C3-C7)
• Longest note: 20 seconds