Each of these covers today have two things in common:
1) They were all recorded on the same day in April 2014.
2) They all featured Krist Novocelic, Dave Grohl, and Pat Smear
These performances were from the 2014 Rock and Roll Hall of Fame Induction of Nirvana, and they decided to do it live with a bunch of different lead vocalists. While each are faithful covers - I mean, the backing band - none of these vocalists attempt a Kurt Cobain impersonation, and that's a good thing.
The first one, "Lithium", from the Nevermind album, features a woman named Annie Clark who Krist Novocelic erroneously introduces as the vocalist from the BAND St. Vincent - Annie Clark IS St. Vincent - but that's not important. What's important is that she was probably the least well-known vocalist of the lot, and this was something of a star-making performance.