"Broly Chronicles", also known by its full name, "Broly: Chronicles of the First Coming (Part 1 of the Cycle of Nothing)" is a music video by Team Four Star.
"Oh, Broly. Of all the Dragon Ball Z characters, why ARE you so strong? There are no answers to be found in this extended cut, but there are some extra lyrics about nut-punching. So, y'know. Enjoy that."