Founded in 1919, the Los Angeles Philharmonic celebrates its 100th birthday with not one, not two, but three conductors sharing the podium: Zubin Mehta, the orchestra’s conductor emeritus; Esa-Pekka Salonen, its conductor laureate; and Gustavo Dudamel, its current director. The program includes Witold Lutoslawki’s Symphony No. 4 (premiered in 1993, an L.A. Philharmonic commission) and a world premiere work “for three conductors” by Daniel Bjarnason. —L.J.