video 1:55
2 July 2014
10 July 2014 Last updated at 14:40 BST
Japanese "cute metal" group Babymetal say they have invented their own genre of music, appearing on line-ups with Metallica and, soon, Lady Gaga.
Newsbeat talks to them about what it's like to tour the world while two of them are still 14 and if they can be a real metal band if they had never heard metal before they formed.
Video journalist: Benjamin Zand
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