The Mission Music Collection contains works relating to the music of the Alta California missions, including works used in religious services, works composed by Franciscan friars, and popular works about particular missions. The collection is divided into two series to represent the Mission Era (prior to 1850) and the Post-Mission Era (1850 and later). Other collections at SBMAL contain musical works; the items in this collection are distinguished by their connection to the mission system.

Series I: 22 Folders containing individual and multiple sheets and full bound books, 4 large antiphonaries, 2 loose large antiphonary pages; Series II: 32 folders

The collection is open for research by appointment. Some items are restricted due to their condition.