Capt'n: I did spend alot of time listening to BabyMetal and Lovebites. Both are metal bands for sure and BabyMetal does have the threesome dancing and singing in perfect sync. However for me no connection for either. Sure they can thrash and shred. But I have heard some of the same chord progressions and drum licks from death metal or grindcore bands in the past. Just the dancing is new and choreographed to the hilt. For Band-Maid, Kanami writes the main line via her highly interesting chord processions , Misa writes her own bass lines, Akane writes her own drum lines to sync with the bass and lead. [ her attack on the high hat is something to behold!], and Saiki and Miku write the interesting lyrics.
Below is Kanami and Saiki playing their songs on piano; one with one song playing 3 handed.......
Here is the rock version of Yolo, the first piano song......
I haven't figured out whether Band-Maid is Power Pop, Hard Rock, Metal, maybe all three. Maybe that is the fun part of this band.