With a keen mélange of 1980s pop slither, muggy shoegaze, and R&B, Berlin-based trio Ballet School occupy a space somewhere near the center of the increasingly nebulous genre of pop music. Their misty debut single “Heartbeat Overdrive” spills forth with gated drumming and soaring vocals, but beneath the song’s heirloom narration-- “You know you catch my eye/ I see you looking my way”-- the tones are spectral and the tempo is directional, a sleek melodicism that possesses infectious modernity.