It’s Seulgi Day, which is typically cause for celebration around these parts. Unfortunately, her lead single “Baby, Not Baby” arrives at the conjunction of two emerging threads: one, my own gradual realization that Red Velvet members don’t really make Red Velvet music when pursuing solo work (made clear by Irene, who does), and two, the promotional build-up to Seulgi’s solo album being kind of a bummer. The very album title, Accidentally On Purpose, makes me a little nauseous. … More New Sluggie