I stumbled upon a wonderful interactive web radio station.
You are given the option to choose the decade you want to hear songs from, the genre and perhaps the most notable and important, the mood—Dark, Positive, Calm or Energentic and any place in between.
Then all the songs display themselves in a nifty shifting weblike structure on your screen as they play.
Dark/Calm 60’s Jazz is a favorite combination of mine so far.
It is called musicovery, click on the title of this post for the link, its addictive.