“Art which uses sound both as its medium (what it is made out of) and as its subject (what it is about)” http://www.tate.org.uk/art/art-terms/s/sound-art
Sound as art is an intriguing concept as it can be the primary medium but also an accompaniment to an existing art work. An example would be artist Laura Owens, who held an exhibition at Sadie Coles HQ last year with a selection of her paintings. As you walked around the exhibition you had the option to listen to audio tracks that had been specifically made for each painting. A gallery exhibiting paintings already has its own aura but adding sound into the combination can create an alternate feel to the atmosphere. It enhances the art thats already there. http://www.sadiecoles.com/artists/owens#lo-laura-owens-2016-img
However as I previously mentioned sound can be the primary medium. Artist Susan Philipsz main focus is how sound can transform a space. She uses recordings of herself singing and projects them into spaces to evoke memories and emotions.
“Sound is materially invisible but very visceral and emotive. It can define a space at the same time as it triggers a memory”. Susan Philipsz