“Cause I-I-I’m in the stars tonight ...”

This is perhaps the 10th time this particularly catchy segment of the hit K-pop group BTS’ song “Dynamite” has played in the past five minutes — not that this bothers the half-dozen or so kids dancing energetically in sync in front of me, a sea of arms waving, bodies twirling and smiles sparkling.

It’s Tuesday evening at Studio Tron, a small, friendly dance school in the Nishiazabu neighborhood of Tokyo. It offers an array of dance classes for all ages, including several kids dance classes and girls hip-hop (there’s even hip-hop with childcare and postnatal classes for moms).