2009 was a huge year for Leyva seeing him go on tour with Ghostface Killah and The Grouch respectively,and on September 24, 2009 releasing a project produced entirely by The Alchemist entitled The Antidote to get the fans hyped up for his debut album Boy Meets World.
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Leyva also organized and put on a Hip-Hop Festival of his own taking place in his home town of Fresno, California entitled Grizzly Fest 2012 on November 17, 2012 which was headlined by Murs and Himself, Husalah, Strong Arm Steady and also included many local Fresno Emcees and a Pro Skate Demo.
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Additionally, Kero One has kept busy collaborating with acclaimed artists from all over the globe like Talib Kweli, Aloe Blacc, Tuomo (Finland), Mark Farina, Ben Westbeech (UK), DJ Deckstream (JAPAN), David Choi, Fashawn, Shing02, Dumbfoundead, The Sound Providers, DJ Mitsu (JAPAN), Abstract Rude and many others.