Diane Warren - 'RBG'

One of the greatest songwriters of all time — a one-woman hit machine for 35 years who has worked with most major singers of that timespan and is synonymous with the 'power ballad' — reflects on how music helped her escape a troubled childhood, the origins of her biggest hits and the inspiration for the call-to-action songs that have led to the three most recent of her 10 Oscar noms.