In the early 1980s Cole’s career stalled because of drug problems and a serious throat ailment. She eventually overcame her difficulties, and by the end of the decade she had begun singing more jazz-inspired pop. Her comeback was completed in 1991 with the release of Unforgettable with Love, a double album that featured her father’s classics, including “Smile,” “The Very Thought of You,” and “Mona Lisa.” A commercial and critical success, it was Cole’s first album to reach number one and earned three Grammy Awards. The title track was digitally engineered to simulate a father-and-daughter duet. Later albums include Take a Look (1993), Snowfall on the Sahara (1999), and Ask a Woman Who Knows (2002). She returned to her father’s songbook for Still Unforgettable (2008), a collection of romantic standards that won the Grammy Award for best traditional pop vocal album in 2009. In 2000 her autobiography, Angel on My Shoulder (written with Digby Diehl), was published.