On mobile, but here’s a few big ones:

Popular (I’d argue mainstream) I’ve not seen mentioned:

Florence and the Machine (no one mentioned her yet? Similar style to Fiest)

St. Vincent (again, pretty well known. Won a Grammy in 2025)

Brandi Carlisle (more folk/country. I enjoy her collaborations more than her solo stuff)

Semi-popular:

Lucious (female duo vocals)

Suki Waterhouse

+1 for The Beaches

Edit to add:

Jenny Lewis

The Kills

From the X-files: https://www.atlasobscura.com/articles/object-of-intrigue-the-xfiles-i-want-to-believe-poster