C4 is the third solo mixtape by American rapper Kendrick Lamar under his alias "K-Dot". It was released in 2009 under Top Dawg Entertainment (TDE). The mixtape contains 17 tracks and includes guest appearances from Lamar's TDE label-mates Ab-Soul, Punch, Jay Rock and BO. The mixtape was heavily inspired by Lil Wayne’s 2008 album Tha Carter III, composed mostly of freestyles over instrumentals from Wayne’s album, in addition to a number of original tracks.
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