Read this: The United States Of Metallica: The story of metal’s biggest band, one state at a time
Originally it was thought that Miley had worked on a full album of ’Tallica covers, but she announced in January that, "I’m doing a song for Metallica’s cover record… So I did a Metallica cover of Nothing Else Matters featuring Elton John on the piano. I’ve got Yo-Yo Ma, [Red Hot Chili Peppers drummer] Chad Smith – just so many all-stars.
"I’m so excited about this collaboration," she continued. "Andrew Watt produced it, and I’m really stoked. I mean, having Elton John and Metallica and me – I love it when ingredients don’t quite fit, you know? Or it seems like a concoction that no-one would ever put together, and you’ve got to have someone wild enough like Watt that will take that risk."
This has got to be what Elton is referring to as well, right? Either way, we're very, very intrigued…