Progressive country was develop in the late 60's early 70's, influenced by rock music and liberal politics!
The music was mainly about life also it was different from normal because of the instruments played, guitar, banjo, bass and riddle. Today this type of music lost popularity in the 80's!
A few artist's during this time was Butch Hancock, Willie Nelson, Billy Joe Shaver (Born in Corisicana).
"On the road Again"- Willie Nelson 1995
"Live Forever"- Billy Joe Shaver 1995
"Dallas"- Butch Hancock 1980
Billy Joe Shaver -