GLASTONBURY, ENGLAND - JUNE 28: Kirk Hammett and James Hetfield of Metallica perform live on the Pyramid stage during day two
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Did you know we're currently in the longest stretch the world has ever endured without a new Metallica album? It's been nearly seven years since 2008's Death Magnetic—and it supposedly won't be much longer till the legendary band's 10th LP appears.

In an Instagram snap from the Metallica HQ studio, bassist Rob Trujillo is either rehearsing, writing, or recording. The photo's shot from behind, taken, we're guessing, by drummer Lars Ulrich. (Shouts to Billboard for noticing the finger tape and the sneaks). The caption? "Rockin along." The new Metallica record cometh at last.
@Metallica on Instagram

Trujillo—who has been headbanging with the band for 12 years—told Billboard that Metallica is doing "really well, actually" and having "a really amazing time" writing the new album, which follows the the 2011 Lou Reed collaboration (and, sorry, stink-bomb) Lulu.

"None of us can predict when that will be," Trujillo told Billboard of the album's release date. "All I can say is we are working hard. It is happening. In the last year we had a lot of detours, whether it was shows or the movie, which took up a lot of our time and kind of sidetracked us from this album. … But we're back now and the main focus is really on new songs and getting them ready to be recorded."

The first Rock in Rio USA festival, beginning May 8 and spanning two weekends, will feature Metallica as a headliner alongside Sam SmithTaylor SwiftEd Sheeran, and Bruno Mars. More than 100 acts will take part, including Charli XCXNo DoubtJohn LegendJessie J, and the Deftones. "Spread over 40 acres on the Strip, the custom-made City of Rock will have the capacity to accommodate 85,000 people per day," the L.A. Times writes, "and also feature multiple stages, a 600-foot-long zip line and a Ferris wheel among other attractions." The festival coincides with the 30th anniversary of Brazil's Rock in Rio, which dubs itself "the world's biggest music festival"; it has also branched into Portugal and Spain.

Back in December, Metallica showed their stuff for American TV audiences by playing a weeklong residency on The Late Late Show with Craig Ferguson, just before Ferguson said sayonara. And a little more than a year ago, James Hetfield & Co. became the first major act to perform in Antarctica.