It's been nearly eight years since Metallica won back fans and critics with Death Magnetic, a return-to-thrash-metal-form, and five since they almost alienated them with their controversial Lou Reed collaboration Lulu. So it's no surprise that they're taking their time to perfect what will be their long-in-the-works 10th LP. They're staying tight-lipped about it's progress – in April 2014, Lars Ulrich estimated they were in the "fourth inning" of the process, though Kirk Hammett guessed they were "30 percent" done a year later – but regardless, they want you to know they're working. Last March, Ulrich said the group was working with 20 songs on the heels of their 2014 tour single "Lords of Summer." They've also teased new material with video of James Hetfield playing a crushing new riff on guitar and of thrashy song snippet on a computer. The band has only one tour date on the books so far, so they'll have plenty of time to release more snippets this year.