qnli question: Along with Barbra Streisand, the Carpenters, Dionne Warwick, Barry Manilow and Olivia Newton-John, what adult contemporary staple found it more difficult to score chart hits in the 1980s? sentence: However, with the combination of MTV and AC radio, adult contemporary appeared harder to define as a genre, with established soft-rock artists of the past still charting pop hits and receiving airplay alongside mainstream radio fare from newer artists at the time.