Evolution is inherently chaotic, yet new species are "discovered," not "invented." Coming back to songs, most chart hits are cobbled together from samples and prior works. It's unclear whether we can all these new creations that occurred in isolation.
You are right, species are discovered when in reference to our defined concept of what it means to be a spiece, that is a structure with all other spiecies. However it's name is an invention, as all definitions are invented.
Yes the song example can be put on a scale, but even the most plagerised of works can call it an invention to an extent when referencing a newly created title.
On a side note, since we all share the most primitive source of information, all behaviours are indirectly stolen on one level or another. But that idea doesn't contribute alot of practicality
