, but there’s probably a reverse “demonic” version of every american popular song. Fun fact, you can bypass any copyright doing this, but you may accidentally call Satan, so it’s up to you to decide whether it’s worth it.
Because it’s unnatural? it’s probably an “uncanny valley” thing. Unlike a foreign language, or a baby babbling, or someone talking gibberish, like Andy Kaufman doing Latka’s language on Taxi, this is a step back from the real thing. Gibberish and baby talk are on the other side of the uncanny valley, I’d guess, and recognize foreign languages, even ones we don’t know, as real, just like we recognize a crowd of people, even people we don’t know, even people who are a different race, gender or age from ourselves, as “people,” and pick out the uncanny robot immediately while ignoring the “other side of the valley” baby doll carried by a small child. But backwards languages are not sounds that are naturally produced by anything-- they are not another language, and they are not the sounds of another animal.
We do a double-take when we see a person walk into a room on their hands, whether it is an acrobat, or someone with no legs, because that is not just another way of doing things, like someone skipping, or on roller skates, but the exact opposite of expectations. We have sort of an idea of hands-feet as a pair of opposites, whether we realize it or not.
You can even creep people out by having someone listen to backwards speech, and memorize it, record it, then reverse it. It doesn’t come out exactly right, and still sounds creepy.
Creation of a derivative work does not bypass copyright, especially not if it’s slavish, which what you’re describing probably is. You might be able to fool software that detects copyright infringement, but that just means that you won’t get caught.
Once upon a time I had one of those toy tape recorders where you could turn a tape over and play it backwards. I listened to a lot of songs (vocals) backwards. I thought they sounded like people talking in Яussian. They were mostly kinda creepy.
There was one, however, that was especially catchy: This Old House by Rosemary Clooney.
Just a few years ago, I discovered that somebody else thinks so, too, because there it is on YouTube: This Old House Backwards !
Also works for This Old House the TV show. There is something sinister about watching Bob Vila tearing up a pristine house and covering it with rotted wood.