It was a curtain call fit for a Broadway and Hollywood king.

Bill Clinton led 2,000 mourners in saying goodbye to Marvin Hamlisch in a celebrity-packed funeral for the award-winning “A Chorus Line” composer yesterday.

“Genius is rare enough, but a good-hearted genius is rarer still,” the former president said.

A chorus of more than 100 singers — including Lucie Arnaz, Rupert Holmes and Sheldon Harnick — lined the sides of the Congregation Emanu-El temple on the Upper East Side as they performed Hamlisch’s hits, including “The Way We Were” and “What I Did For Love,” during the service.