He performed with Parliament-Funkadelic; Lenny White; Marcus Miller; Sting; Mary J. Blige; Earth, Wind and Fire; and Louis Hayes.
At the beginning of the 1970s, he played with Parliament/Funkadelic, Earth, Wind and Fire, and Roy Ayers, before becoming a member of Lenny White's group Twennynine, for whom he penned songs such as "Peanut Butter" and "Morning Sunrise".
He released his self-titled debut solo album in 1982 on Arista Records, including the songs "Holding You, Loving You", "Heart's Desire" and "Since You've Been Away So Long" that became major hits in Europe.
Blackman also worked as a session musician, appearing on albums by Kurtis Blow (Kingdom Blow), Bernard Wright, Najee, David Sanborn, Lenny White, Roy Ayers, Sting (Brand New Day), World Saxophone Quartet, Janet Jackson's "That's the Way Love Goes" (Remix) and Wayman Tisdale.
[citation needed] On television, he scored and wrote music for commercials, TV shows, and movies, appearing on Fox Network's New York Undercover, producing and writing the theme song for Nickelodeon's show "Gullah Gullah Island", as well as producing songs for the MTV Network movie Joe's Apartment.