Since gosta mentioned Karin Krog, I will list some vocal cds I enjoy...
Karin Krog: "Where You At"
https://www.youtube.com/watch?v=gR4swScUD_QSarah Vaugah: "Live in Tokyo Complete Edition"
https://www.youtube.com/watch?v=meoiTxJofOsSheila Jordan: "Lost and Found"
Can't find any sound samples
Sheila Jordan: "Portrait of Sheila"
https://www.youtube.com/watch?v=5VFT2zc1lbI&list=PL0q2VleZJVEmZ4zvGNH1l74rupONXEokXTina May: "More Than You Know"
https://www.youtube.com/watch?v=CNnINzQqfbQAnita O'day:"Sings for Oscar"
https://www.youtube.com/watch?v=3Iru1VZR5gc&list=OLAK5uy_mnGDY4a8xtjZmoEovWLzWjiFE4_TLK2aM&i...Betty Carter: The Audience With Betty Carter"
https://www.youtube.com/watch?v=-HaMhJF3i88&list=OLAK5uy_nUljP8wcIAGTTGA2m4Yo1W1LkzbfZWVYUJackie Ryan: "Doozy"
https://www.youtube.com/watch?v=c5-eje2RMCMJackie Ryan: "You and the Night and the Music"
https://www.youtube.com/watch?v=F8NnVxgmdJ4Helen Merrill: "A Shade of Difference" and "The Feeling Is Mutual'
https://www.youtube.com/watch?v=B697MtyPgOMAnd for those with more esoteric tastes... not really jazz but improvisational music on ECM that's uncategorizable:
"Sumiglia" and "Songs of An Other".
Based in folk music from Greece, Spain, Turkey, eastern Europe that gets very spacy and atonal at times, wandering off into explorations of pure sound I couldn't find any tracks on youtube from these releases but here's a couple live videos. The second one shows at her absolute wildest (some of you may say 'her weirdest" and I won't disagree but it's a type of weird I enjoy).
https://www.youtube.com/watch?v=UpwW0wt6V30https://www.youtube.com/watch?v=UpwW0wt6V30