Sally Montoya, a slender, graceful native New Yorker who met Carlos while her father was working for the Foreign Service, was once a Spanish-style dancer herself, but gave it up because "I obviously didn't dance as well as Carlos plays. I'm a casualty of his success." The couple has two sons. Except for travel, Carlos Montoya has few interests outside his work. "Music and family -- that's all," he said quietly. "To be an artist, you must be a slave to the instrument and to the public. To play the guitar is a serious thing -- not a game. To me, it is a complete life." ******** WESTSIDER MELBA MOORE Broadway star releases ninth album 10-14-78 When Melba Moore recently dropped out of her co-starring role in the Broadway hit musical _Timbuktu_, there was a lot of speculation as to the reason why. Some observers suggested that Eartha Kitt, the biggest box office draw, did not like to share the billing with a performer of Melba's caliber. Melba herself has a simpler explanation: seven months of one show is enough, and she had too many other things to do -- promoting her new album, preparing for another Broadway musical, doing her first lead role in a movie, going on a concert tour, making guest appearances on television, and taking care of her 16-month-old daughter Charli. "Honey, I could join the Olympics with all I do," says Melba one afternoon at the comfortable midtown office that is used as the nerve center for her multiple activities. She is dressed in a striped hat, a white shirt and a bright red necktie. Easing her slender form onto the couch, she looks smaller, younger, and more beautiful in person than her photographs indicate. I remark on her flashy necktie, and Melba, using her hands expressively while she speaks, tells with amusement how she saw it on the collar of a salesman at Fiorucci's and said to him, "I want that tie." Melba's first professional stage role was in _Hair_; from 1968 to 1970 she rose up through the chorus to win the female lead. "I have no hard-luck stories," she says, in her clear, nearly accentless voice. "From _Hair_, I went right into _Purlie_." That was the role that earned her the 1970 Tony Award for Best Supporting Actress and the New York Drama Critics' and Drama Desk Awards. Melba was born 32 years ago on West 108th Street. Both her parents were entertainers, and Melba began singing at the age of 4. At college she majored in music, and upon graduation, taking the advice of her parents to "get some security," she taught school for a year. But soon a burning desire to get into show business took hold of her, and she quit teaching. "Ever since that day," she recalls, "even before I got my first singing job, the whole world looked better to me."