While DaCosta looks convincing as Houston, it's singer Deborah Cox
who is actually heard on the 1990 single, which was re-recorded specifically for the film. "Angela [Bassett], who is a friend, approached me about singing a few songs," Cox tells Billboard
of being asked to fill in for the late-singer on "I'm Every Woman," "I Will Always Love You," and "Greatest Love of All." "Obviously, the best-case scenario would be to use Whitney’s voice. But we’re all very passionate about telling Whitney’s story with integrity and very sensitive to all the talk."
The singer--who recorded the duet, "Same Script, Different Cast" with Houston--promises no "Deborah Cox seeped into the performances."