Seventeen-year-old Kaylyn Steward and her mom, Kendalynn Jackson, were passing out campaign literature for Democratic Sangamon County State’s Attorney candidate Mike Drake Saturday on afternoon when she spotted a man in a Black Lives Matter T-shirt.Thinking it could have been a protest, they stopped over.But as it turns out, a different form of expression was being exercised — music.What they came across was the Hip-Hop Xpress, a school bus that serves as a mobile recording studio,