Since releasing his debut album in 2014, Benjamin Booker has become a major name in modern blues-rock. The singer and guitarist incorporates punk and soul music on his sophomore album "Witness," which features politically charged lyrics and a guest spot from gospel singer Mavis Staples. Shortly after headlining the Underground Music Showcase in Denver, Booker stopped into the CPR Performance Studio. He performed three songs from "Witness" and spoke with Alisha Sweeney about working on the album in Mexico City, how his collaboration with Staples came about and his crowd-diving set at UMS 2017.