Purchasing music by decade on iTunes store for offline use

Why can't I search for music by decade on iTunes store?

I want to BUY music and put it on my iPhone without needing iCloud or internet connectivity, you know old school iPod, buy music, own it, put it on you devices, etc.

I know that apple's online app has decades (usually playlists limited to 20 songs or less, explain that one to me).

Mike

[Re-Titled by Moderator]

Original Title: iTunes STORE