1981-Harper Valley

This has got to be the first TV show based on a movie based on a song ever.
The 1978 movie was pretty funny from what I remember, at least it was in the 70s. The movie shot up in popularity when aired on TV, so NBC thought they would have a hit show on their hands.
Barbara Eden reprised her role from the movie as the outspoken Stella Johnson of the song who turned out to be more principled than the hypocritical PTA that was critical of her.
The whole PTA aspect of the show was eventually dropped when producers realized they had carried that angle about as far as they could go with it. Later episodes focused around the relationship between Stella and her daughter, and (shark jump moment) a new character was introduced; wacky uncle Buster.