At the after-party for the L.A. Philharmonic’s gala kicking off its new season on Thursday, the talk was about the impromptu sing-along.

L.A. Phil execs said they had no idea star Renee Fleming was going to lead the audience in “I Could Have Danced All Night” from “My Fair Lady.”Deborah Borda, prexy of the L.A. Phil Assn., said the gala, one of two fund-raisers for the org, is a special event. “We get to close down the entire street,” she said referring to a block of Grand Avenue that served as the site of the after-party. “And we get to enlist people like Renee Fleming.”

She also pointed to the combination of attendees, which included student beneficiaries of the org’s Music Matters as well as Jack Nicholson, Nancy Meyers, Diane Keaton, Cybill Shepherd, Frank Gehry, Sherry Lansing , Michael Eisner and L.A. Phil conductor Esa-Pekka Salonen.

Evening helped raise more than $1 million for Music Matters.