Here is an example: https://www.youtube.com/watch?v=Wx0oU1OnHf8&t=1s

I would argue that Rap and many other musical genres cannot be traced back to an origin at all. Like most things, they are the sum of many influences over longer periods and are more akin to evolutionary in development than spontaneous appearance.

Bad poetry to rhythmic music has been around a lot longer than 80 years.

Rap can be traced back to rhyming songs from the pre-christian era.

Hip Hop on the other hand was born in the late 70s.-

Yeah, I remember a TIL that was basically about vikings having rap battles against one another. There was diss track levels of poetry in Rome and other historical societies as well

Personally tho I theorize that all edm music can be traced back to James Brown, due to his use of rhythm and loops

That sounds a lot like that song sampled in Moby's Run On:

Run On For A Long Time - Bill Landford And The Landfordaires

EDM is basically modern disco. Disco has strong ties to early R&B. You might be onto something.

Funk may or may not have been a base for house, it most definitely was for hip-hop: tons of samples were taken from old funk and soul records (the Amen-break being used the most, but Funky drummer and others being not far behind).

sprechtstemmer in opera for instance

You might also be interested in Pigmeat Markham who did what is considered the first rap song called Here Comes the Judge.

Very interested, thanks

Boast Battle! https://youtu.be/H7rHTUNAz0g

The first rap song was Night Mail by W.H.Auden performed by John Grierson in 1936, unless anyone can prove otherwise.

In the Poetic Edda, Loki's flyting was so insulting to the other gods it sparked ragnarok. Basically a rap battle got out of hand, ending the world.

google: flyting,
viking poetry insults battles.