I went over to Amazon HD for awhile but every once in awhile, I see where Pandora takes me and lately they have been knocking it out of the park with 'new-to-me' material, and a lot of it. Amazon seems to glitch up a bit and start recycling the same bucket of songs like a set list.
Pandora has been just keeping me looking at the credits to see who it is so I can see what else they have. Been on since around 11 AM (is now almost 9 PM) and I don't believe I have heard the same song twice. All of this based on a station created by a single group. They have also managed to stay within the relative category.