Youth Orchestra Los Angeles

Isaac Green, a bassist for Youth Orchestra Los Angeles, does jazz improvisation on the saxophone.  (Lawrence K. Ho / Los Angeles Times)

Isaac Green plays the bass during a 2014 rehearsal at Walt Disney Concert Hall.  (Lawrence K. Ho / Los Angeles Times)

Gustavo Dudamel compares hair styles with bassist Isaac Green after a rehearsal by Youth Orchestra Los Angeles.  (Lawrence K. Ho / Los Angeles Times)

Isaac Green rehearses for YOLA in 2009, when he was 12 years old.  (Lawrence K. Ho / Los Angeles Times)

Violinist Rodas Hailu is a study in concentration during rehearsal with Youth Orchestra Los Angeles at Walt Disney Concert Hall.  (Lawrence K. Ho / Los Angeles Times)

Rodas Hailu, 11, of YOLA rehearses at the Expo Center in 2008. Fellow YOLA member Jonathan Caselin, 12, watches.  (Lawrence K. Ho / Los Angeles Times)

Vivian Trejo, a 13-year-old French horn player, has won a scholarship to the Colburn School in downtown Los Angeles.  (Lawrence K. Ho / Los Angeles Times)

Vivian Trejo, 12, practices her French horn at home in Los Angeles. Trejo participates in YOLA through the Heart of Los Angeles program.  (Lawrence K. Ho / Los Angeles Times)

Gustavo Dudamel leads Youth Orchestra Los Angeles in a performance at Walt Disney Concert Hall on May 10, 2014.  (Lawrence K. Ho / Los Angeles Times)

Youth Orchestra Los Angeles was started by the L.A. Philharmonic in part to help persuade Gustavo Dudamel to become music director.  (Lawrence K. Ho / Los Angeles Times)

Members of the Los Angeles County High School for the Arts choir and orchestra, which partners with YOLA, rehearse.  (Lawrence K. Ho / Los Angeles Times)

Tuba player Honorio Antonio, 13, rehearses with Youth Orchestra Los Angeles as part of the Harmony Project at the Expo Center.  (Lawrence K. Ho / Los Angeles Times)

Gustavo Dudamel gives the wind section of the Expo Center Youth Orchestra, which partners with YOLA, pointers during rehearsal at the Hollywood Bowl on Oct. 1, 2009.  (Lawrence K. Ho / Los Angeles Times)

Gustavo Dudamel poses for pictures with Expo Center Youth Orchestra members at the Hollywood Bowl on Oct. 1, 2009.  (Lawrence K. Ho / Los Angeles Times)

Trumpeters are all business for the Expo Center Children’s Orchestra on May 14, 2008.  (Lawrence K. Ho / Los Angeles Times)

Cello students practice in the hallway before the first recital of the Expo Center Children’s Orchestra on May 23, 2008.  (Lawrence K. Ho / Los Angeles Times)

Clarinet students perform in the first recital of the Expo Center Children’s Orchestra on May 23, 2008.  (Lawrence K. Ho / Los Angeles Times)

Rehearsal before the first performance of the Expo Center Children’s Orchestra at Santee High School on Aug. 2, 2008.  (Lawrence K. Ho / Los Angeles Times)