Hip hop has been marking the 40th anniversary of its creation, when DJ Kool Herc started scratching records and rapping at a house party in New York's Bronx.

In the past four decades, groups and artists such as Public Enemy, De La Soul, Tupac and Jay Z have become household names.

But there are claims that the genre is even older and can trace its roots back much further into history.

British rapper and founder of the Hip-hop Shakespeare Company, Akala, ran BBC News through a brief history of the art form.

Video journalist: Chris Parkinson