In 2008, in advance of his debut album, Troubles of the World, Castle released the sixth part of the Fahrenheit 1st and 15th mixtape series, The Testimony of GemStones [REF].
As Castle began to spread rumors of his return to hip hop, he expressed his desire to leave 1st and 15th Entertainment shortly before Lupe Fiasco discontinued the label in November 2009 [REF].