C4 (mixtape)
C4 is the third solo mixtape by American rapper Kendrick Lamar, then known as K.Dot, released on January 30, 2009, through Top Dawg Entertainment (TDE). Heavily inspired by Lil Wayne's sixth studio album Tha Carter III (2008), the mixtape primarily consists of freestyles over the production from Tha Carter III, in addition to a few original songs. C4 includes guest appearances from Lamar's TDE label-mates Ab-Soul, Punch, Jay Rock, Schoolboy Q, and BO.
Source: Wikipedia
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