If you're looking for a movie that's an accurate portrayal of Hank Williams life, be forewarned, Your Cheatin' Heart is NOT the movie for you. This film takes some of the basic facts of Hank's life, adds in some events of its own, and then dramatizes a story around those facts and events. Hank's wife Audrey was the technical adviser for the film, which of course, makes the film somewhat slanted to present her in a good light.
The Hank Williams songs in the movie are done by Hank Williams, Jr. (who was only 15 at the time) and George Hamilton lip synches them. Hamilton does a good enough job with the lip synching that it doesn't distract from the film.
Just like when Richard Thomas played Hank Jr. in Living Proof, George Hamilton seemed an odd choice to portray Hank Williams, but Hamilton really does a credible job in making you believe he's Hank Sr. A few years later, he would also do another great acting job in portraying the title character in another biopic, Evel Knievel. As stated above, Your Cheatin' Heart is more of a dramatic film with a few true facts about Hank Williams' life mixed into the storyline. It's still a pretty good movie, and as long as you view it with that fact in mind, you should enjoy this film, I know I did.