[4][5]: 3  [6] The Articles of Incorporation were signed by the charter members on December 8, 1909 and filed in the office of the Secretary of State of Ohio.

[4] In 1923, this date was established as "Founders Day" since not all collegiate institutions at which chapters were installed had opened for the fall semester by September 6.

This has sometimes caused adverse reactions on some campuses in some cases, such as recruiting new members and promotional materials (especially those that spell out the full greek letters in their name), along with other greek organizations that share letters or names with those of COVID variants, which also were at least partly impacted by these effects.

[16] Membership is determined on the basis of talent, scholarship, and character and is open to collegiate music students enrolled in schools where Delta Omicron chapters are located, to music faculty members in those schools, and to professional musicians.

Collegiate chapters are chartered in accredited institutions of higher learning and derive their names from the Greek alphabet in the regular sequence according to the date of installation.

Eight chapters - seven collegiate and one alumni - were established in South Korea, due largely to the work of Lenore Harpster Lutz, who traveled to the country with her husband, a missionary.

International collegiate chapters derive their names from the Greek alphabet, prefixed by the letter Kappa.

The Whistle of Delta Omicron International Music Fraternity—Alumni Newsletter is the official publication of the fraternity for alumni-at-large.

[24] It was originally distributed to all alumni members of the fraternity annually via mail, however, since January 2004, it has been published online on the Delta Omicron website.

Citations are presented by the National Board of Directors to individuals or corporations whose support of music or the arts is deemed worthy of recognition.