I find the 'old' singers - their voices and songs - can be revisited over and over again without feeling like I ate too much. Nina Simone and her deep yet soulful voice is one of them. She's a great pianist too. In fact, she was a pianist first before she started singing, and plays the piano herself in her concerts. I got my first Nina Simone CD in Singapore when I met up with a friend and we went shopping in 1994 or 1995.
Here's a sample.
Listen to her piano playing in this one! Wish I could play like this!