Los Angeles Philharmonic music director Gustavo Dudamel, he of the curly mop and the incredibly dynamic presence on the podium, took over his current post from San Francisco Symphony maestro Esa-Pekka Salonen in 2009 at the tender age of 28. Now he takes up the baton in Davies Hall for the first time in 14 years to lead Salonen's orchestra through two major pieces of the concert repertoire: Wolfgang Amadeus Mozart's weighty Symphony No. 38, the "Prague," and Gustav Mahler's famed Symphony No. 5, with its tender fourth movement Adagietto composed with his wife, Alma, in mind. But there is rockier, more thunderous terrain in its other four movements, as Mahler indicated in a letter to Alma after his first rehearsal of it: "Heavens, what is the public to make of this chaos in which new worlds are forever being engendered, only to crumble into ruin the next moment? What are they to say to this primeval music, this foaming, roaring, raging sea of sound, to these dancing stars, to these breathtaking, iridescent and flashing breakers?" Whew. Looks like the Dude has his work cut out for him. There are four performances: 7:30 p.m. Thursday through Saturday and 2 p.m. Sunday. Tickets, $69-$225, are at https://www.sfsymphony.org/ or (415) 864-6000.