Metallica cancels tour dates after singer James Hetfield enters rehab
James Hetfield will be entering rehab after "struggling with addiction on and off for many years," his bandmates said. (CNN) - Metallica says it is postponing its tour in Australia and New Zealand after lead vocalist James Hetfield reentered rehab. "As most of you probably know, our brother James has been struggling with addiction on and off for many years," the band's tweet said. "We appreciate your understanding and support for James & thank you for being a part of our Metallica family." Metallica formed in 1981, and it is known for the hits "Enter Sandman," "Master of Puppets" and "One."