Software to COMPARE 2 songs for % similarity?
 

Hi All, I'm new to this forum. I'm working on research for a lawsuit involving original songs that one of the writers later "slightly" modified and resold as "new" to circumvent the original partner's interest in the community work. Is there some type of software to analyze and compare 2 titles and come up with a % similarity? Or something else quantitative? And easy (since I'm not really a music person :)) ? Or point me to a more applicable forum if this isn't the right spot?

Thanks!!!