Lorraine Hansberry’s 1959 play “A Raisin in the Sun” is a landmark of American theater. It had three hit Broadway runs with its story about the struggles of a Black family in mid-century Chicago. Less well-known is the musical adaptation, called simply: “Raisin.” The Black Rep is performing the seldom-seen show through Sunday. As St. Louis Public Radio’s Jeremy Goodwin reports, “Raisin” depicts racist systems that still impact life in St. Louis today.