According to The Pulse Of Radio, METALLICA paid tribute to GREEN DAY at the Voodoo Music + Arts Experience in New Orleans on Saturday (October 27).The rock band stepped in to GREEN DAY's slot after Billie Joe Armstrong checked in rehab for substance abuse, forcing GREEN DAY to cancel a series of appearances. But GREEN DAY wasn't forgotten at the annual music festival. During METALLICA's two-hour set, James Hetfield told the crowd, "We're GREEN DAY, just a little taller." Hetfield later mentioned GREEN DAY again, saying, "They're getting it sorted out, hopefully they get it fixed because the world needs them." After that, METALLICA played a riff from GREEN DAY's "American Idiot". METALLICA also dedicated the "Master Of Puppets" track "Battery" to Armstrong, telling the audience, "This one's for Billie." METALLICA guitarist Kirk Hammett spoke to Fuse about the band's addition to the Voodoo Music + Arts Experience, telling the channel. "We got a message about [in early October] asking us if we're able to fill in for GREEN DAY, because Billie Joe was having some issues," he said. "We discussed it between the four of us and we all said, 'Yeah, it would be great thing for us to do and it would also be great to help out Billie Joe, 'cause he's a friend of ours and we love GREEN DAY. If we can help them out in any way possible, we're always happy to do it, 'cause we love those guys. It's actually an honor for us that they approached us and asked if we can fill in." Hammett recently told Billboard that the band will start working on a new album soon. On Decemeber 10, METALLICA will release a live DVD called "Quebec Magnetic".