Evaluating Pixie Lott

Lowest note: B2
Highest belt:  G5
Highest note: C6
Exclamation: N/A
Vocal grade:  B
Vocal range: 2 octaves 6 notes

Vocal positives:
Relatively well supported belts from C5 onwards. She possesses a nimble voice that can flip registers with ease. Her voice is raspy in most registers.

Vocal negatives:
Her chest voice sounds damaged and belts above C#5 sounds shrill because her voice is raspy.

Pixie Lott hitting a B2:

Evaluating Lea Michele

Lowest note: Eb3
Highest belt:  Bb5
Highest note: D6
Exclamation: N/A
Vocal range: 2 octaves 7 notes 1 semitone
Vocal grade: A*

Vocal positives
Her upper belts are her strongest feature(C5-Bb5), filled with resonance and can slice through the thickest of instrumentation without sounding force. Her diction has generated praise for being able to allow her to convey her emotions expertly. She has been seen holding a belt as high as A5 for extended periods of time without showing signs of fatigue.

Vocal negatives:
Notes above Eb5 sound shrill because she achieves them without using vibrato.

Evaluating Emily Osment

Lowest note: D3

Highest belt:  E5

Highest note: B5

Exclamation: C#6

Vocal grade: B

Vocal range: 2 octaves 5 notes

Vocal positives:

She is comfortable with doing low notes, reaching D3. Her belting is solid, reaching up to an E5.

Vocal negatives:

She gets tired easily and does not showcase her full range in live settings. She goes off-key very often even without moving and her chest voice gets weaker very quickly as it ascends from D5 live.