ผมลองศึกษาหาข้อมูล เกี่ยวกับ vocal range ของศิลปินต่างประเทศมาสักระยะแล้ว
1 อ็อกเทฟ
วัดตามตัวโน้ตก็คือ C1 ถึง C2 เป็น 1 อ็อกเทฟ
โดยมีตัวชาร์ป (#) กับตัวแฟลต (b ) เข้ามาอีก เหมือนเป็นโน๊ตกึ่งเสียง
(กำหนดให้ C = โด D= เร E= มี F= ฟา G=ซอล A=ลา B=ที )
ผลที่ได้ เรามาดูกันเลยครับ


Mariah Carey
Octave Range: 5.2 (F2 - G#7)
Longest Note: 19 sec.
Highest Note(s): G7, G#7, , A7, F7
Lowest Note: F2
Highest Belt Note :A5
Type: Alto

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Celine Dion
Octave Range: 3.6 (A2- E6)
Longest Note: 20 sec.
Highest Note(s): A5, C6,E6
Highest Belt Note : C6
Lowest Note: A2
Type: leggiero mezzo soprano

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Whitney Houston
Octave Range: 4 (A2 - A6)
Longest Note: 19 sec.
Highest Note(s): C6, B-b5, A6
Lowest Note (s): A2
Highest Belt Note : A5
Type: dramatic mezzo soprano

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Christina Aguilera
Octave Range: 4.5 (Bb2-Eb7)
Longest Note: 20 sec.
Highest Note(s): Eb7, F#6, E6, Eb6, Bb6, A#6
Lowest Note(s): Bb2,C3, D3, Eb3
Highest Belt Note : G#5
Type: Spinto Soprano

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Aretha Franklin
Octave Range: 4 (E2-E6)
Longest Note: 14 sec.
Highest Note(s): C#6,D6,E6
Lowest Note(s): E2,A2,Bb2,C3, D3, Eb3
Highest Belt Note : D6
Type: Dramatic Mezzo Soprano

..............................................................

Jennifer Hudson
Octave Range: 3.1 (C3-C#6)
Longest Note: 15 sec.
Highest Note(s): C#6
Lowest Note(s):C3,Eb3
Highest Belt Note : C6
Type: Dramatic Soprano

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Beyonce Knowles
Octave Range: 4 (F2-F6)
Longest Note: 14 sec.
Highest Note(s): F6
Lowest Note(s):F2,A2/Bb2, B2, C3, C#3, D3, Eb3, E3, F3
Highest Belt Note : A5
Type: Coloratura (Light-Lyric) Mezzo

...............................................................................

Erykah Badu
Octave Range: 3.5 (D3-B6)
Longest Note: 20 sec.
Highest Note(s): B6
Lowest Note(s): D3,E3
Highest Belt Note : F6
Type: Mezzo-Soprano

..................................................

Nina Hagen
Octave Range: 6.1 (G#1-B7)
Longest Note: 20 sec.
Highest Note(s): B7
Lowest Note(s):G#1,D2,E3
Highest Belt Note : B5
Type: Soprano

...................................................................

Rachelle Ferrell
Octave Range: 5 (G2-G7)
Longest Note: 27 sec.
Highest Note(s): G7
Lowest Note(s):G2,D2,E3
Highest Belt Note : C#6
Type: Contralto
...............................................................

Betty Wright
Octave Range: 5 (C3-C8)
Longest Note: 10 sec.
Highest Note(s): C8
Lowest Note(s):C3,D3,F3
Highest Belt Note : F#5
Type: Alto
.........................................................
Chante  moore
Octave Range: 4.3 (C3-F#7)
Longest Note: 26 sec.
Highest Note(s): F#7
Lowest Note(s):C3,E3
Highest Belt Note : G5
Type:  Coloratura Soprano

......................................................................

Minnie Riperton
Octave Range: 4.2 (D3-F#7)
Longest Note: 25 sec.
Highest Note(s): F#7
Lowest Note(s): D3,Eb3
Highest Belt Note : G5
Type:  Coloratura

.......................................................................

Yma  Sumac
Octave Range: 4.5 (G#2-C#7)
Longest Note: 9 sec.
Highest Note(s): C#7
Lowest Note(s):G#2,B2
Highest Belt Note : C#5
Type: dramatic coloratura soprano

..........................................................................

Debelah  Morgan
Octave Range: 3.5 (C3-Bb6)
Longest Note: 9 sec.
Highest Note(s): Bb6
Lowest Note(s):C3
Highest Belt Note : G5
Type: coloratura soprano

..............................................................................

Shanice
Octave Range: 3.7 (D3-C#7)
Longest Note: 8 sec.
Highest Note(s): C#7
Lowest Note(s): D3
Highest Belt Note : C#6
Type: Spinto coloratura soprano

.................................................................

Patti labelle
Octave Range: 3.8 (Bb2-F6)
Longest Note: 21 sec.
Highest Note(s): F6
Lowest Note(s): Bb2
Highest Belt Note : D6
Type: Dramatic soprano
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บางคนที่ยกมานั้นไม่ได้มีดังมากครับ อาจจะไม่รู้จัก แต่ที่ยกมาคือลุกเล่นในการใช้เสียงครับ

อย่าง erykah badu เสียง belt เธอสูงมากครับเท่าที่เคยได้ยินมา

chante moore พูดตามตรง หวีดใสมาก แถมยังหวีดไล่โน๊ตได้สุดยอดมากๆครับ

แต่ยังไงทุกคนก็สุดยอดมากๆครับ