02:01 U.S. rock group Metallica's new album, 'Hardwired... to Self-Destruct', could be their best ever, according to bassist Robert Trujillo, but guitarist Kirk Hammett will always be left feeling something was missing. Hammett's contribution to the band's tenth studio album, and first in eight years, was scaled back after he lost a phone containing scores of riffs during writing sessions. "It's never a good feeling when something that we work hard at and you put so much time invested and you have so much expectations for it all of a sudden disappears.