Students from Louisville High School in Woodland Hills, Mayfield Senior School in Pasadena and Paraclete High School in Lancaster will raise their voices along with 900 singers from over 20 Southern California secondary school choirs at the 15th Annual High School Choir Festival on April 23 held for the first time ever at the new Disney Concert Hall.

The free 1 p.m. concert is the culmination of a year-long in-school music education program presented by the Los Angeles Master Chorale. This year's program will include works by six composers spanning the centuries: Lumen ad revelationem by William Byrd; Der Gang zum Liebchen by Johannes Brahms; Regina Coeli by W.A. Mozart; Alleluia by Randall Thompson; Salmo 150 by Ernani Aguiar; Good News, The Chariot's Comin', arranged by Moses Hogan.

Tickets are required for the event. To reserve a free ticket or for further information, call (213) 972-7282 or visit the Walt Disney Concert Hall Box Office, 111 South Grand Avenue in downtown Los Angeles.