There is a vocalist who almost never gets any airplay on the local Nashville radio stations, but I am becoming a huge fan of Alicia Keys. She has several albums out and sing s variety of styles. Some can call her pop, others might call her jazz. some might even all her R&B. I just call her adult contemporary.
If you have a chance, give her a listen on Spotify or Pandora. One of my favorite songs of hers is a duet, “Lesson Learned,” with John Mayer. Good song!