[modeless]

The only song generator I like is https://sonauto.ai because you can upload clips of real songs and change the lyrics like a Weird Al parody. I suspect that's all most people would like to do with these apps, and I also suspect that they don't let you do it for legal reasons, not technical reasons.

Here's one I did, "Can You Feel the AGI" to the tune of "Can You Feel the Love Tonight": https://x.com/modeless/status/1792058258523668702

[lostmsu]

How exactly do you replace song's lyrics with your lyrics on this website?

[modeless]

You upload a clip and type a description that matches the music you uploaded plus the different lyrics you want. You may have to tune the settings to get it to change the lyrics without making too many changes to the melody. There's a slider to control the relative importance of the uploaded music vs the typed lyrics and instructions. You may also have to tweak the spelling of the lyrics to guide the pronunciation.