Comfortable notes from powerful voices

Mariah's comfortable vocal range: A2-C7 (4 Octaves, 2 notes)
Xtina's comfortable vocal range: D3-A6 (3 octaves, 4 notes)
Beyonce's comfortable vocal range: G#2-E6 (3 octaves, 4notes, 1 semitone)
Ariana's comfortable vocal range: G#3-G#6/Bb6! (3 octaves)
Demi's comfortable vocal range: Eb3-Eb6 (3 octaves)

Marina Diamandis vocal range

Vocal fach: Light Contralto

Vocal range: G#2-E6 (3 octaves, 4 notes, 1 semitone)

Studio vocal range: Bb2-E6 (3 octaves, 3 notes, 1 semitone)

Live vocal range: G#2-D6 (3 octaves, 3 notes, 1
semitone)

Marina's vocal range:

Ella Henderson vocal range

vocal fach: lyric soprano (with spinto and light-lyric qualities)

vocal range: Eb3-F#5-A6 (3 octaves, 3 notes, 1 semitone)

studio vocal range: E3-A6 (3 octaves, 3 notes)

live vocal range: Eb3-F#6/G6 (3 octaves, 2 notes)

Ella's studio range

Ella's Eb3 ^

Nicole Scherzinger vocal range

vocal fach: lyric soprano

vocal range: B2-B5-G#6 (3 octaves, 5 notes, 1 semitone)

studio vocal range: B2-G6 (3 octaves, 5 notes)

live vocal range: D3-G#6 (3 octaves, 3 notes, 1 semitone)

D3-G#6

Nicki Minaj vocal range

vocal fach: soubrette

vocal range: A2-F6 (3 octaves, 5 notes)

studio vocal range: A2-C#6 (3 octaves, 2 notes, 1 semitone)

live vocal range: C#3-F6 (3 octaves, 2 notes, 2 semitone)

Rachelle Ferrell vocal range

vocal fach: coloratura contralto

vocal range: G2-E6-F7 (4 octaves, 6 notes)

studio vocal range: G2-Eb7 (4 octaves, 4 notes, 1 semitone)

live vocal range: G2-F7 (4 octaves, 6 notes)

live vocal range^^