Oct 11, 2016 TDE haven't said anything regarding the song. I think it's some unreleased OD or Setbacks
Oct 11, 2016 We’ve been blessed with a raw version of a new Kendrick Lamar x Schoolboy Q track, titled “The Heart Pt. 4”. The track was uploaded via Shade 45 and XM radio host DJWHOOKID, so you know the clip is legit. There’s no information around the tracks release, “if it ever does come out” according to Whookid; so all we can do is enjoy the clip of this heater in the meantime. "Looks like we have a new Kendrick x Schoolboy Q leak today! It’s a snippet, which is currently titled “The Heart Pt. 4″ and has the essence of a demo cut. Stay tuned for the CDQ version, if there is even one. POW!" http://runthetrap.com/2015/05/10/kendrick-lamar-x-schoolboy-q-the-heart-pt-4/
Oct 11, 2016 Just did a quick search on ktt. The song was called "broke my heart" and dude who traded it said it was the heart part 4... then Shade 45 and other blogs told everyone it was the next chapter in the heart series.