Question: What milestone did Celine Dion, Mariah Carey, Phil Collins, Michael Bolton, Whitney Houston and Shania Twain share on the 1990s adult contemporary charts?
Sentence: Newer female singer-songwriters such as Sarah McLachlan, Natalie Merchant, Jewel, Melissa Etheridge and Sheryl Crow also broke through on the AC chart during this time.
Answer in sentence: no