12 Jul 2004 Jahr - In 2004, at the age of 16, Lamar released his first full-length project, a mixtape titled Youngest Head Nigga in Charge, under the pseudonym K-Dot. The mixtape gained local recognition for Lamar, leading to him being signed by independent record company Top Dawg Entertainment, with whom he began recording new record material and consequently released a 26-song mixtape in 2005, called Training Day. Between 2006 and 2007, Lamar would appear alongside other rising West Coast rappers, Jay Rock and Ya Boy, as o (Band der Zeit)