Disco was under heavy attack at that time by classic rock platforms everywhere. They were upset that disco took over the music scene all over the world for so long. That's why when Nirvana came along they promoted the heck out of them and the whole grunge scene. Its not supposed to be a competition but...$$$.
I literally had to go back and listen to about 2 minutes because I missed it laughing at the dude getting in the shot, and the look on his face when he realized it lmao!