Chemist (Thomas Sheridan) and Mooke (Rodney Mynatt), the duo that formed the local hip-hop group Smoke Screen some 15 years ago, were friends long before the group came to fruition. They grew up together, and officially launched Smoke Screen when Mynatt 's uncle's band, the Slick, got a show at the now-shuttered Peabody's and asked them to play a show with him. One of the city's top hip-hop acts, they celebrate the release of their latest album with tonight's show at the Grog Shop in Cleveland Heights. The concert begins at 8.