Director Allen Hughes on 'The Defiant Ones'

The new four-part documentary series The Defiant Ones on HBO traces the rise of music titans Jimmy Iovine and Dr. Dre, from their childhoods, respectively in Brooklyn and Compton, to their partnership in founding the headphone company Beats Electronics -- which Apple bought in 2014 for $3 billion.

The Defiant Ones is massive -- both in terms of the ground it covers and the sheer volume of interviews with musical luminaries who have worked with Dr. Dre and Iovine over the years.

Born to Run.

The Chronic. But when Iovine first heard the album, he was floored, and an unlikely partnership was born.

The filmmaker who directed all four installments of The Defiant Ones is our guest Allen Hughes.

Menace II Society. They went on to direct Dead Presidents, From Hell and The Book of Eli before they began to pursue solo careers.

The Defiant Ones.