Metallica 'Just Getting Started' With Lady Gaga, Their 'Perfect Fifth Member'

Metallica and Lady Gaga's GRAMMYs collaborative performance on Sunday should've been a co-headlining moment, but technical difficulties made it more of a "Gaga featuring Metallica" moment. (Good thing she just headlined the halftime show of the biggest televised event in the galaxy.)

But the "Metal Militia" dudes are still all good vibes when it comes to Mother Monster. Drummer Lars Ulrich tells Rolling Stone's Jason Newman he sees Gaga as the "quintessential perfect fifth member of this band." He says they've already "started fast-forwarding to the next chapter when we can do more of this", adding that it's "about as organic and authentic" a collaboration as the band has ever done. (Sorry, any stray Lulu fans out there.) "We're just getting started," Ulrich promises.