This collection documents American Theatre Organ Society events and several major organ companies in small artifacts. The majority of the items in this collection are buttons relating to ATOS regional conventions and performances. Other refer to various chapters of the society, including the Atlanta, Alabama, Young Theatre Organ Enthusiasts, and Rocky Mountain Regional chapters. Some nameplates related to major organ companies (Æolian, WurliTzer, and Robert Morton Organ Co.) are included. The items with dates range from 1978-1989. With little accompanying contextualizing information, the significance of some of these items is not immediately apparent.