Which country are we talking about?

Do people who write and promote songs in Nashville live in the country?

The best way to write a country song for the popular music country market is to first:

Write a good song.

Then:

It helps if you are a part of that culture.

Then:

Sell that sucker as a country song through a country artist.
It can even be: "I Will Always Love You" but not "Hello Dolly".