His favorite music moments included Baroness's upcoming album Purple, getting his "best" guitar sound yet, Pepper Keenan's return to Corrosion of Conformity, meeting Robert Plant - and Justin Bieber being photographed wearing a Metallica T-shirt.

The pop star faced backlash on social media from metal fans after appearing on the Ellen Show wearing the top last month, as well as posting a photo of himself wearing it on Instagram in June.

But Metallica said in a 2013 interview with Q Magazine that they were fans of the singer. Hetfield said: "Are we Beliebers? Yes." Drummer Lars Ulrich added: "Is it possible to have respect for him without being a Belieber? I think the kid's really talented and obviously to go through what he's going through at that early age must be a mindf***. So the fact that he still goes out there and does it, I admire that and I think he's super talented, so I guess I am kind of a Belieber." See Hetfield's list - here.

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