Streisand, who first met Hamlisch in 1963 and sang his song "The Way We Were" to a Grammy Award win in 1974, is headlining a star-filled private musical tribute to her friend at The Juilliard School.
The composer, who became the youngest person accepted by Juilliard at age 7, died Aug. 6 in Los Angeles.
Also scheduled to perform are Aretha Franklin, Liza Minnelli, Itzhak Perlman, Michael Feinstein, Chris Botti, Maria Friedman, Brian d'Arcy James and Carter Brey, as well as former cast members of "A Chorus Line" and cast members of "The Nutty Professor," the musical Hamlisch was working on when he died.
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