SFMOMA’s On the Go programming concludes with the California debut of Janet Cardiff’s immersive sound installation The Forty Part Motet, co-presented with the Fort Mason Center for Arts & Culture. The installation is the inaugural exhibition for Gallery 308, a newly renovated historic space at Fort Mason. Cardiff has gained international distinction for her site-specific audio and video walks, which use prerecorded narratives to guide viewers through various indoor and outdoor locations. Considered Cardiff’s masterwork, The Forty Part Motet is a forty-part choral performance of English composer Thomas Tallis’s sixteenth-century composition Spem in Alium, sung by the Salisbury Cathedral Choir. The performance is played in a fourteen-minute loop that includes eleven minutes of singing and three minutes of intermission. Individually recorded parts are projected through forty speakers arranged inward in an oval formation, allowing visitors to walk throughout the installation, listening to individual voices along with the whole. Cardiff’s layering of voices creates an emotionally evocative sound sculpture that feels intimate, even within a public space.