The guitarist collaborated with the band.
Dragonforce guitarist Herman Li gave an interview to Loudwire where he commented on Babymetal's sound. Li previously collaborated with the band on the song " Road Of Resistance ". Check out his statement:
"They create a very original mix of different Metal styles with a Japanese Pop vibe. I know the guys who work on Babymetal, on the music and everything, and they're big Metal fans, they're really cool guys and they truly love the music. Obviously, the girls are young and they've just started out, but they're great performers. They've been doing this for a long time and they're super professional."
"When I was their age, I didn't have a chance of doing that. I think they're able to make a crossover and bring people who've never heard of Metal to the genre, to discover it. So it's an important band now. For example, we have many Metal fans because of Guitar Hero. I think they're an important band because of that; we need more people who can do different things, and they're cool girls. I enjoyed working with them."