Michael Tilson Thomas conducts this performance of a work he created, one that’s particularly dear to his heart. It’s the culmination of a 10-year project researching and reconstructing the music of the Yiddish theater as performed by the famed Thomashefsky troupe in the late 19th- and early 20th centuries. (Tilson Thomas is the grandson of Bessie and Boris Thomashefsky.) Cast includes Nearl Benari, Judy Blazer, Eugene Brancoveanu and Ronit Widmann-Levy. Directed by Patricia Birch. Preceded by an Upbeat Live talk by Chad Smith, Los Angeles Philharmonic vice president of Artistic Planning at 7 p.m. on Thurs. and Sat., Dec. 18 and 20; and 9:45 a.m. on Fri., Dec. 19. Walt Disney Concert Hall, 111 S. Grand Ave.; Fri., Dec. 19, 11 a.m.; Sat., Dec. 20, 8 p.m.; $42-$147. (323) 850-2000.