While the organization was incoporporated in 1969, the bulk of the materials date from 1989-2002. Materials of highlight in the collection include consistution/bylaws (n. d. and 1969) board minutes (1981-1983; 1990-2002). The program year corresponds to the academic year rather than the calendar year. Concert files include some performance recordings (n.d., 1989, 1992) on VHS tapes that have been digitally remastered, newspaper clippings and programs. A few materials on LYSO tours exist as well (1996, 1999, 2001).