The Mission also has the oldest unbroken tradition of choral singing among the California Missions and, indeed, of any California institution. The weekly Catholic liturgy is serviced by two choirs, the California Mission Schola and the Cappella Barbara. The Mission archives contain one of the richest collections of colonial Franciscan music manuscripts known today, which remain closely guarded (most have not yet been subjected to scholarly analysis). The original City of Santa Barbara developed between the Mission proper and the harbor, specifically near El Presidio Reál de Santa Bárbara (the "Royal Spanish Presidio"), about a mile southeast of the Mission. As the city grew, it extended throughout the coastal plain; a residential area now surrounds the Mission, although there are public parks (e.g. the Mission Historical Park and Rocky Nook Park) and a few public buildings (such as the Natural History Museum) in the area immediately adjacent to the site.