My favorite thing is to listen to instrumental jazz jams. Some times I'll try a female vocalist, but I play it once or twice and that's the end of it. On very rare occasion, I hear someone who makes all that go out the window. I got a couple of "Incognito" CDs as a gift recently. They are a hell of a band and their lead vocalist Maysa Leak has an incredible voice and more talent than you can imagine. She makes my JBLs sound so good! If you haven't heard her, click on these links -- you will be glad you did.
http://www.youtube.com/watch?v=42LVlmW9WVE&feature=related
http://www.youtube.com/watch?v=9wySgliqzac&feature=related
http://www.youtube.com/watch?v=iViamUsDchg&feature=related