An unlikely but fascinating collision of kawaii J-pop and heavy metal, Tokyo's BABYMETAL features SU-METAL (Suzuka Nakamoto), MOAMETAL (Moa Kikuchi), and YUIMETAL (Yui Mizuno). The trio began as a subgroup of Sakura Gakuin, a more traditional-sounding J-pop act whose members leave the group once they graduate from junior high school. Taking their name from producer Kobametal's concept that BABYMETAL marked the birth of a new genre, the group arrived in 2011 with the song "Doki Doki Morning," which introduced their mix of sugary vocals and melodies with pummeling riffs and drum...