"Just Begun" is a song by American hip hop duo Reflection Eternal, composed of New York rapper Talib Kweli and Ohio producer Hi-Tek. The song was released on February 2, 2010, as the second single from their second studio album Revolutions per Minute (2010). The song is a posse cut featuring verses from rappers Jay Electronica, J. Cole and Mos Def, the latter of which also forms a duo with Talib Kweli, known collectively as Black Star.

The song's production was handled by Reflection Eternal's Hi-Tek. The song contains samples of "We've Only Just Begun" as performed by The Singers Unlimited. The four recording artists rap in succession, without a bridge or refrain separating their verses. They compliment their verses by continuing each other's rhyme scheme. Jay Electronica and J. Cole share nose imagery with "I’m on a higher level, I’m on top of nosebleeds / Niggas say they sick, but when they rock they don’t sneeze". Mos Def practices internal rhymes, rapping "Get off him, there is not a parcel or a portion / Or a measure of a fortune more awesome". Talib Kweli makes references to Donnie Brasco, The Count of Monte Cristo, Iago and Othello of Othello, the Moor of Venice, as well as cigarillos.

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