“Contact High” includes some of Janette Beckman’s early hip-hop photography — she was a key portraitist in the 1980s. In her new book, “The Mash Up” (Hat & Beard; $40), many of her old shots are used as source material for graffiti artists, who draw atop them. (The book is curated by Cey Adams, responsible for developing much of hip-hop’s graphic identity in the 1980s). The most simpatico work comes from early era graffiti writers: Crash drawing on Futura, Lady Pink on Queen Latifah, Part One on Eric B. & Rakim. These pieces feel like dialogue, not tug-of-war, and radiate the sense of hip-hop as a living, breathing tradition, with innovators and inheritors, forever learning from one another.