Though she's only 34, Vartan has been France's preeminent woman pop singer since she was one of the "yé-yé"—for "yeah-yeah"—girls of the early '60s. (An equivalent to her stormy 16-year-old marriage to male counterpart Johnny Hallyday would be, say, a Presley-Ronstadt union here.) But she has had little exposure in the U.S., perhaps because until now she has never recorded in English. She has, it turns out, almost no accent and a husky sort of sweetness to her voice used in this album on disco-ish rock (Dance to the Rhythm of Your Love is a positive example) and unsentimentalized ballads (Easy Love). Sylvie's a strong enough singer and interesting enough personality to stand a chance of being the first person born in Bulgaria ever to have a hit on American charts.