Evening With Valerie Simpson in Honor of Nick

Gwen Ifill interviews Valerie Simpson, who for more than 40 years wrote hit-making songs with her husband, the late Nick Ashford. Ashford & Simpson's classic songs include: "Ain't No Mountain High Enough," "Ain't Nothing Like the Real Thing," "Reach Out and Touch (Somebody's Hand)" and "I'm Every Woman." As performers, their best-known duets are "Solid" and "Found a Cure." This is an intimate tribute to their artistry, with performances by Patti Austin, Kindred The Family Soul and Valerie Simpson.