[3] She studied music at Howard University, where Camille Nickerson, Hazel Harrison, and Todd Duncan were among her instructors.

[5] Holloman made her professional stage debut in 1950, at the Circle-in-the-Square Theatre, in a musical drama, The Barrier.

[2] The New York Times reviewer noted afterward that "Miss Holloman demonstrated a vocal range and facility nothing short of phenomenal," and "She executed staggeringly difficult arias as casually as if they were Marchesi vocalises".

[12] In 1967, she sang at a benefit concert in tribute to Philippa Duke Schuyler at the Town Hall venue.

[5] She appeared in The Magic Flute, Tosca, Madama Butterfly, Das Rheingold, and many other operas, and toured with Todd Duncan and Margaret Bonds in the Bahamas.