Only two other female stars (Dorothy Page and Jane Frazee) were top-billed singing cowgirls at the time.

One of her last live-action roles was as Jessica Fletcher's Aunt Mildred on the Murder, She Wrote episode "The Perfect Foil" (1986).

She provided the voice of Jane Jetson in the 1962-63 animated series, The Jetsons. From 1985 to 1987, Singleton reprised her