Rootbeer is a Hip-Hop duo from Los Angeles consisting of Pigeon John and Flynn Adam Atkins. Both are former members of Christian rap group L.A. Symphony.
The simple shortcut to that Rootbeer descriptive word puzzle could be something like "MGMT injected with some N.E.R.D. and A Tribe Called Quest". As clearly evident in their lyrics and style, Flynn Adam and Pigeon John are unapologetic purveyors of popular culture.