Before To Pimp A Butterfly, before good kid mAAd city, even before Section.80, Kendrick Lamar was introduced to the world with a video that found him spitting daggers over the the beat from Yasiin Bey's "Umi Says." Part 2 was released a short time after that, showing off K Dot's penchant for soulful, jazzy constructions even then, and when Part 3 dropped in the months leading up to GKMC, you already knew his name, and the Pac comparisons would roll from there.  Now a new, wholly unofficial installment has surfaced of "The Heart," featuring a gritty, dust-clad soul sample, cracks and snaps, and what seems to be spry versions of the Compton bomber and his TDE label-mate Schoolboy Qbusting out gangsta love raps, hook provided by what may be BJ The Chicago Kid . And as much as I'd like to say that this is Part 4 of the 5-years-and-running series, the track does not resemble, in tone, lyrical content or production quality, the Lamar of today, and more realistically is something left off of a mixtape treatment. But it's always a good day for some new bars from Mr. Lamar and Puffy Q, and we'd rather leave the verdict in your hands. So rock with this new-ish joint from Kendrick Lamar and Schoolboy Q, and be sure to leave your two cents in the comment section below.