Producer extraordinaire, Alchemist, celebrated his born day yesterday – but it’s all the real heads who got the best gift. As a thank you to his fans for all the Birthday love, he released a stashed Mobb Deep joint called called Biology. First things first; the beat is crazy. It boasts gritty production and solid verses, especially from Prodigy – he straight up blazes this track with at least 3 quotables you’re sure to see on Twitter over the next few weeks. Listen to the track after the jump.

So celebrate the anniversary of Alc’s birth, and if you missed it yesterday, be sure to tweet him a happy belated (and a thank you).