70's vs. 80's

I put together a quick playlist on IMEEM of forgotten 70's songs that don't get played even on big 70's internet channels, maybe not even on the tv 70's radio channels.
But I got to thinking I should expand it to the 80's. But the 70's are still a fertile field. Playlists were larger on AM stations back then, that's why so many acts crossed over from the Country and R&B charts. By the 80's playlists tightened, videos came aboard and music has been easier to find from that era.
There are still a lot of 70's stuff missing on CD.