The performance, titled “Celebrating Gustavo at the Bowl: Beethoven 9,” marks Dudamel’s 17 years as the orchestra’s music director. By Carlos ReyesGustavo Dudamel will conduct the Los Angeles Philharmonic in Beethoven’s Symphony No. 9 and a new work featuring lyrics by poet Amanda Gorman on Thursday, Aug. 20, at the Hollywood Bowl. The 8 p.m. performance, titled “Celebrating Gustavo at the Bowl: Beethoven 9,” marks Dudamel’s 17 years as the orchestra’s music and artistic director. After intermission, Dudamel will lead Beethoven’s Ninth Symphony, known for its “Ode to Joy” finale.