With Sinatra, Andy Williams, Vic Damone and Robert Goulet at, or nearing, the age when they can no longer defensibly make a career of singing moony ballads, there are openings in the male romantic singer market. Carlos, 38, a Brazilian and Latin America’s top pop music star for 15 years, is seeking to fill one spot with his first made-in-U.S.A. album. He began as a rock—or, in the Brazilian idiom, “Yi, yi”—singer. His hits were usually on the energetic side—Splish Splash and Tutti Frutti as well as such local numbers as I Want Everything to Go to Hell. Here he stays dreamy, with his own You Will Remember Me and Breakfast as well as such American tunes as Paul Williams’ Loneliness. Carlos has a casual way with a lyric, a husky voice and a dashing accent (reminiscent of Frenchman Charles Aznavour). He could cause some swoons in the Northern Hemisphere.