I don't think that I realized how contentious the words "drawl" and "twang" were when it came to Texas accents until I started writing about them.  In my experience, "drawl" referred to Southern accents as a whole, while Texas got its own category as a "Texas Twang."

After George Strait released his album, Twang, I felt justified with the alteration of using "Texas twang."  After all, if it's good enough for King George, it's good enough for me. 

I'll probably address this in an author's note somewhere, because I'm sure to get emails advising me that I am, in fact, "wrong" for using "twang" instead of "drawl."  Still, I'm sticking with my choice.  It's a Texas twang, or it will be in Madison.