You only think that Kurt Cobain was the lead singer for Nirvana, but the geniuses at the Yahoo! front page have news for you: The group’s name wasn’t really Nirvana. That’s why they put the name in quotation marks:
Or… There is an alternate explanation for those punctuation characters: The Einsteins have no idea when to use quotation marks. This is probably the first time in journalistic history they’ve been used to surround the name of a band. Perhaps in some other country, where the writer lives, it’s correct; but it’s not in the U.S.