MUSIC

Oscar-winning composer Marvin Hamlisch and journalist Terre Blair will marry on May 29, 1989, the couple has announced. Hamlisch, 44, has won three Oscars--two for “The Way We Were” and one for “The Sting”--a Tony award, four Grammys and a Pulitzer Prize for his music and writing. He will be musical director for next month’s Academy Awards telecast. Blair, a former correspondent and producer for “The Today Show,” “ABC Wide World of Sports,” “P.M. Magazine” and “Monday Night Football,” is a free-lance television reporter.