It is described as the “soundtrack to a Catalan prison,” one designed by Paez i Blanch’s firm, and it relies on an unusual graphic score “based on a map of the prison that registers the emergent life that also occupies the building.”
The design of the penitentiary itself was also documented in a book recently published by Actar.
I’ve included some photos of the facilities here, but you can see many more over at Dezeen.
Finally, for more details about the composition’s debut in Wales next month, see here.
(Thanks to Ed Keller for the tip!)