Khari Mateen has been steadily building his reputation as a producer in Philly’s hip-hop community. However, the classically-trained musician and multi-instrumentalist has also continued to forge out on his own. Here’s a track from his latest EP Qualia: Fall that demonstrates Mateen’s diverse ear as he blasts through the rollicking garage-blues number called "Where Did They Go," which was created to help draw attention to people suffering from Post-Traumatic Stress Disorder (PTSD). You can stream the single below and download it for free.