For her sophomore set A Nu Day, the Quincy Jones protegée (and Grant Hill missus) Tamia joins the Toni Braxton school of hammy, self-conscious soul-singing that’s more about affectation than honest emotion. Label mate Missy Elliott pitches in with staccato beats and street-savvy lyrics, but Tamia’s cloying wails lack edge and conviction. She turns even the most heartsick and angry sentiments into prettified pain. C-