Here's the original Supremes member, the late Florence Ballard singing Little Anthony & the Imperials' "Going Out of My Head":

The best voice and the sexiest one out of all three of them. I loved that woman

Niice. I agree she definitely was the sexiest and most beautiful
of the supremes. It is criminal there hasn't been a movie of her
life. Is this song from an unreleased solo project?

phunkdaddy said:

Yeah, it was supposed on Flo's 1968 debut album on ABC titled I Don't Have To but because of poor promotion of the first single ("Doesn't Matter How I Say It"/"Love Ain't Love"), they shelved it.

Someone in England released all the songs from that album plus other sessions and five early Supremes sides when Flo was singing lead on as part of an album called The Supreme Florence "Flo" Ballard in 2002.

She was blackballed by Berry Gordy, that's why you never heard the record.