Fresh from her collaboration with Gustavo Dudamel and the LA Phil in her new concert film “Happier Than Ever: A Love Letter to Los Angeles,” Billie Eilish comes to Sound/Stage. Get a sneak peek here, and tune in to laphil.com/soundstage on October 22 for the entire episode. Find LA Phil videos, podcasts, music, and more at http://laphil.com/watchlisten