The 'Nothing Else Matters' hitmaker has gushed about the 'Hello' singer's ''unbelievable'' live shows and praised her ''candour and coolness'' up on stage.
He told BBC Radio 6 Music: ''I have to tell more stories ... She's got funny stories!
''I love her, she's unbelievable and blows my mind. Her voice and her candour and coolness about being up there and being as huge as she is. She's so down to earth.''
And James previously revealed Amy Winehouse's death inspired a song on their new album 'Hardwired... to Self-Destruct'.
Talking about the song 'Moth Into Flame', he said: ''The film about Amy Winehouse inspired me to write that song. It's a sad movie. Fame can be a dark, dangerous drug. Everybody wants a piece of you. It totally changes your view of the world.
''Fame has followed me around since we formed the band. It's a Pandora's box that often makes you wonder: 'Okay, how do I now become unfamous?'''
Meanwhile, drummer Lars Ulrich previously revealed he finds it ''harder'' to be in a band now than he did when the group was starting out
He explained: ''It's harder to be part of a collective when you're older. When you're 22, you all wear the same clothes, drink the same beer, do the same crazy things. Then, all of a sudden, you're in your 30s and 40s and everything has changed.''
Whilst James added: ''Those guys know my story and I know their story. We love each other and we hate each other. But we're brothers ... I felt like a loner my whole life so connecting with people is what I want to do. This is great - playing people some new Metallica music. Why do we torture ourselves about this stuff? Why did we take eight years?''
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