Before revision: Sound installation 290px|Janet Cardiff's Forty Part Motet (2001) in the ARoS Aarhus Kunstmuseum, Denmark 140px|Georges Lentz's 24-hour String Quartet(s) at the Cobar Sound Chapel (2022), with loudspeakers in the four walls Sound installation is an intermedia and time-based art form.
After revision: Sound installation 290px|Janet Cardiff's Forty Part Motet (2001) in the ARoS Aarhus Kunstmuseum, Denmark 140px|Georges Lentz's 43-hour String Quartet(s) at the Cobar Sound Chapel (2022), with loudspeakers in the four walls Sound installation is an intermedia and time-based art form.