Re: This is how you handle TV networks that demand playback performances!
Didn't say it was new, I just thought it was funny, and an excellent "screw you" to the TV station. As for Nirvana, they didn't swap instruments, and Kurt Cobain was actually singing (badly on purpose).
Maiden did this on a German TV show back in the 80's, with the members swapping instruments throughout the song. Then Oasis did it in the 90's, with the Gallagher brothers swapping places for a Top Of The Pops performance.