In order: Brother Lynch Hung, GrewSum, Lo Key, Tech N9ne.
I'm not sure but I think it's an official remix.
This was on Chemical Threats (Phase 2), which also had the "I Want That" song with Grewsum & Kutt which was done for Grew's Donnie Darkflow EP before it appeared on Darkflow 2.0
A Grewsum song with Kutt AND Skatter & Snug? First I've heard of this.