Bob Harris talks to Diane Warren, the songwriter behind some of the best-known ballads in pop music history, including Aerosmith's I Don't Want to Miss a Thing, Toni Braxton's Un-Break My Heart, and LeAnn Rimes' How Do I Live. She discusses her career writing for artists including Celine Dion, Roy Orbison, Mariah Carey, Tina Turner and Barbra Streisand, reveals some of the key tools of her trade, and performs a selection of hits from her back catalogue.