Honestly speaking, I have been not recognized Heavy Metal as a genre of music.
Here I found a exception: BABYMETAL.
They say "this is a phenomena from Japan" and "it is fusion of Japanese idol and heavy metal".
Tons of heavy metal fan with long hair, beard, tattoo are addicted to BABYMETAL. They found Japanese idol for the first time.
The three singers/dancers of BABYMETAL are placed top class in Japan but not known very well in Japan.
Here are the "IDOLs" in Japan (including BABYMETAL). Can you find another BABYMETAL to come?