Lots of great names listed above. One I didn’t see was Monica Zetterlund. Start with Ahh! Monica! and if you like what you hear (you will) move on to Swedish Sensation and others. 
Female vocalist recommendations
My morning routine starts at 530/am. Light breakfast, and my morning tea.
I then power up my audio system and listen to my morning favorites.
I love soothing female vocalists at this time of the morning.
Here are some of my favorites- Norah Jones-Jacintha-Abigail Lapell-Amber Rubarth-Anette Askvik-Margo Timmins-etc
I'm really looking for some other recommendations by the great minds on Agon.
Any and all suggestions are appreciated....and great recordings are a bonus.
Thanks in advance.