At right, Gustavo Dudamel embraces architect Frank Gehry as they view Gehry’s model for the new YOLA Center. But this new home for the L.A. Philharmonic’s signature music education program, Youth Orchestra Los Angeles, he said, “is what has me most excited and proud.” Gustavo Dudamel proposed training young musicians in underserved communities when he was appointed the L.A. Phil’s …