On the recommendation of a friend, I've been listening to music by an artist named Madeleine Peyroux.
It is bluesy/jazzy with a little bit of country tinge. However, the most remarkable thing is that Ms. Peyroux's voice reminds me of Billie Holiday and, to a degree, Ella Fitzgerald every time I hear it.
I couldn't listen to this all of the time, but it is a refreshing listen on occasion. If you have Real Rhapsody, there are links below to playlists for each of her available albums.