You must be joking. If there's ANYTHING from the 70s that has endured, it's Funk and Prog. I bet no one has ever heard of Pink Floyd.
It sounds dated because you associate it with a certain time period. And that's okay. If I hear baroque music, I think of the 1700s.
The synths!
Most Prog bands heavy in keyboards and synths tend to have a distinctive sounds that have a ten year lifespan.
Remember the Oberheim, the DX7, etc.......
