Even though Hank Williams died when I was two years old, I grew up listening to his songs. "I Can't Help It If I'm Still In Love With You" is one of my favorites. I'm going to lead off with a version by Williams himself.
The next rendition is by Patsy Cline. Cline had a powerful and versatile voice. Crazy and I Fall to Pieces are among the most beautiful performances of the 20th century. Here is her take on "I Can't Help it if I'm Still In Love With You".
Finally, here is Linda Ronstadt's version, with backup from Emmy Lou Harris.