Bernard -- That was me about 7 years ago. I called the thread something like "songs that can't exist" because they only exist within themselves. Sometimes I call them "self-advertizing songs".
I have a small collection of what I call "pure" ones.
Tennessee Waltz I've never been sure about because it may be they were dancing to a tune called that and not a the song. Same with Bonepart's Retreat, Sam's Song, Elmer's Tune etc.
I have a list somewhere of songs that qualify as songs that can't exist.
"Truck Driving Man" is the one that started me off. "Heart of My Heart" is another and "La Montanara".
Cheers, Joy