It was pretty hard to miss the start of the Los Angeles Philharmonic’s 100th-anniversary season in September. Projected onto the outside of Walt Disney Concert Hall for a week beginning on opening night was Refik Anadol’s “WDCH Dreams” light installation, created using data points from images, audio, and video from the orchestra’s archives. Inside the hall, centenary celebrations will include an impressive 54 world premieres during the 2018-19 season. In September, a daylong eight-mile street party temporarily closed streets from Disney Concert Hall to the Hollywood Bowl. More than a thousand musicians, artists, and dancers performed at six hubs and along the route itself, and the day concluded with a free Hollywood Bowl concert featuring the Los Angeles Philharmonic, Katy Perry, Herbie Hancock, Kali Uchis, and Youth Orchestra Los Angeles (YOLA). Throughout the anniversary season, most of the orchestra’s former music directors will return to lead concerts, and the centennial year will mark a major expansion of the Youth Orchestra Los Angeles program, created by Music Director Gustavo Dudamel. The season concludes with—you guessed it—Mahler’s “Symphony of a Thousand.”