So it turns out that when St Vincent covered 'Lithium' in Chicago, she was actually rehearsing for Nirvana's induction into the Rock and Roll Hall of Fame, where she performed the song again with the backing of Krist Novoselic, Pat Smear and Dave Grohl. And she wasn't the only guest vocalist the trio invited to fill Kurt Cobain's shoes for the evening - Lorde contributed to 'All Apologies', Kim Gordon to 'Aneurysm' and (best of all) Joan Jett to 'Smells Like Teen Spirit'.
Incidentally, Gordon's Instagram has been ranked among the fifteen best by Vogue. Worth a look for some vintage photos of her from the Sonic Youth days, as well as pics that indicate she's as much of a starstruck fan as those who meet her - the snap of her with Stevie Nicks taken at the Hall of Fame ceremony is captioned: "Oh my god!! Finally met the ultimate rock goddess?".