Except they were corporate rock and roll. So that posed an issue.
This video was their temporary solution.
Longtime fans of Nirvana know that this was the 2nd time they had recorded the song. It was originally released as a single - with this video - in 1990. The song was originally recorded before Dave Grohl joined the band - and the video recorded right after. Whereas the later single and Nevermind version includes Grohl on harmonies - the scream going into the chorus and the chorus itself is actually two voices - this version contains no such harmony vocal.