knowledge is part of it, talent is most of it. A very large percentage of those who know the English language are very poor creative writers. and many who can play an instrument can't compose. They know the mechanics and can deliver a basic product. But writing memorable prose, dialogue, poetry or lyrics is a different thing. Same with musical composition. Robbie Robertson was arguably the least musically talented member of The Band, Garth Hudson being the most. Robbie was the writer. Garth can't write. Same with Brian Jones of The Stones. Knowledge and talent are related but they're not twins...more like second cousins.

Nashville demos etc:

https://www.soundclick.com/bands3/default.cfm?bandID=431939

other demos:

https://soundcloud.com/wabash-cannibal

Amazon Kindle books by Robert George you may enjoy:

1) Americana

2) Teenage Graceland

3) The Will to Be

4) Fort Mystery

5) Wheel Sea

6) My One True Love