Oft imitated but never equaled, the DJBooth Freestyle Series ran from February 2009 through June 2011. Its 250 total entries were the work of a veritable who’s-who of underground and emerging emcees, including rising stars like Kendrick Lamar, Wiz Khalifa and Mac Miller. Now, it’s back for a second round. The seventh entry in the recently-relaunched series comes courtesy of Astro, the Brooklyn wunderkind who brought us Yes I Know My G back in December. On I Don’t Know, an understated synth instrumental by Oris Beats accompanies the emcee as he showcases his mic skills in brisk, braggadocious bars. Astro doesn’t currently have any forthcoming projects on the agenda, but we’ll keep you posted on his 2014 plans as further details emerge.