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Men chika (メン地下) is the Japanese underground male idol scene, made up of boy groups who perform high-energy J‑pop and dance-pop in small live houses, theaters, and idol events rather than on major mainstream stages.

J-pop (Japanese pop) is a broad umbrella for mainstream Japanese popular music that blends Western pop/rock, dance, and R&B with distinctly Japanese songwriting, vocal delivery, and industry practices.

Boy band is a pop-oriented vocal-group format built around a small ensemble of young male singers who are marketed as a unit. The music emphasizes instantly memorable hooks, tight vocal harmonies, and polished production, and is typically paired with synchronized choreography and a carefully…