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Dr Dre's first album for 16 years is top of the charts and a film charting the rise of NWA - his breakout 90s gangsta rap group - is playing to packed cinemas. Over the past 25 years Dr Dre has made an indelible mark on popular culture. After NWA he founded a record label and turned producer - making global stars of artists like Snoop Dogg and Eminem. And he's a hugely successful businessman. His Beats brand - whose headphones have become a ubiquitous fashion accessory - was sold last year to Apple for $3bn (£1.8bn). It's all a long way from his start in life as a poor child to a teenage mother in Los Angeles. But, as Mark Coles hears, there's a dark side to Dr Dre's story of almost unimaginable success. Producers: Keith Moore and James Melley.