Need suggestions: High pitched female singers

Cristina Deutekom singing in Mozart's 'Magic Flute'. Sings Queen of the Night with much enthusiasm - coloratura soprano at its best. Solti conducting.

Joan Sutherland singing the songbird in Wagner's Ring, also by Solti.

As mentioned Joni Mitchell and pretty much perfect pitch when "measured".

DeKay

Britney Spears & Ariana Grande

Yep, Minnie Riperton, first to come to mind, four octive range. I like her work with Rotary Connection, very unique sound. As an aside, her mother was the inspiration for  Cab Calloway's, "Minnie The Moocher".

Regina Spektor