Hip hop turns 50 this summer and its influence has been felt in all corners of the globe. From the streets of the Bronx to a revolution in Beirut, from anti-apartheid messages in Cape Town to graffiti in Cairo, throughout the summer we’ll be exploring Planet Hip Hop. To help us kick off our series we turn to H. Samy Alim, professor of anthropology and director of the Hip Hop Initiative at UCLA. He’s also co-editor of the book “Freedom Moves.”