The Alexandria Choral Society is celebrating 50 years with the opening of its fall season program “The Spheres” on Oct. 19, according to a news release.

The ACS is one of the oldest choral societies in the region, Maurisa Potts, a public relations representative for ACS, said. This year’s lineup is the largest its ever had, with more than 100 singers.

“The Spheres,” led by artistic director Brian Isaac, will feature choral and string pieces composed by Gabriel Fauré, Ola Gjeilo and Alexandria’s own Jonathan Kolm. The program aims to lead audiences on a journey “from the heavens to earth,” according to the release.

ACS’ 50th season opens in the Rachel M. Schlesinger Concert Hall, 4915 E. Campus Drive on Oct. 19 at 7:30 p.m. The full slate of performances will take place on Dec. 14, March 7 and May 9, according to the release. Tickets are available at www.alexandriachoralsociety.org.