"Inside the ancient chapel was the first presentation of contemporary art ever at the Cloisters: “The Forty Part Motet,” an 11-minute immersion
in a tapestry of voice, each thread as vivid as the whole fabric. A sacred composition of Renaissance England is rendered by the multimedia artist
Janet Cardiff through 40 speakers — one for each voice in the Salisbury Cathedral Choir, which performed the piece in 2000. What started as one
microphone per singer is now a choir of black high-fidelity speakers arrayed in an oval, eight groupings of soprano, alto, tenor, baritone and
bass.
In the intimate space of the museum’s Fuentidueña Chapel, the sound, from invisible people, as if from ghosts, feels like charged, living
sculpture. Through Dec. 8, it plays in a loop all day."
I'm also linking to a Youtube video of the same music at another venue; this is slightly longer and perhaps a better recording:
I do not know how to print the link but if you go to YouTube, search for Libera Lament you will find a blue album cover to press for another piece of
Music which brings me tears.