The tagline from the Kickstarter sums up the project pretty succinctly:
Rappers get old. Their music stays the same age. We interview rap personalities past, present and future; from indy to mainstream.
Recently, they released a limited edition cassette with a collection of music from Adult Rappers. It features music from the film as well as exclusives and other originals from artists including: Alaska, Cryptic One, Dezmatic, Homeboy Sandman, J57, Mister Jason and Paten Locke and J Zone.
You can stream the release, grab a digital copy of it, or order the cassette all on their bandcamp.