Motherfuckers askin' "who is that?"
You know it's the almighty Black Jack

from Kanye West (Ft. Freeway & Yasiin Bey) – Two Words Lyrics on Rap Genius

“Black Jack Johnson” is the name of Mos Def’s rock band, first heard on his album The New Danger. The band was named after boxer Jack Johnson, the first black man to hold the world heavyweight championship

The personnel of Mos' band is:

Dr. Know (Bad Brains) — guitar
Bernie Worrell (Parliament, Funkadelic, Talking Heads) — keys
Doug Wimbish (Sugarhill Records, Living Colour) — bass
Will Calhoun (Living Colour, Marcus Miller) — drums

Watch the band in action here

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