http://www.michaelmedia.org/soundbox
The soundboxes started as an experiment to find out what would happen if you start with sound instead of image (which is the usual way in most net art).

http://www.devoid.co.uk/walls
A musical journey heard through the fabric of old buildings, composed and performed by Roger Mills.

http://alcor.concordia.ca/~mfa/speaking_mountains/
The project documents the success of having The 7
Famous Mountains surrounding Bergen speak; and how The Speaking Mountains learned from The Fields of Academic-Know-How.