I want to know the answer to the following question:
Mainstream artists from what decade generally did not have success on the adult contemporary charts?
All the background I'm provided with is that "Unlike the majority of 1980s mainstream singers, the 1990s mainstream pop/R&B singers such as All-4-One, Boyz II Men, Rob Thomas, Christina Aguilera, Backstreet Boys and Savage Garden generally crossed over to the AC charts.". Is that enough to answer the question?
Answer: yes