qnli question: Along with All-4-One, Boyz II Men, Rob Thomas, Christina Aguilera and Backstreet Boys, what 90s artists were notable in the pop/R&B genre? sentence: 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.