‘A Song for the Absentees’ is an interactive sound installation by Jee Won Kim where participants’ voice trigger various sounds of animals that are endangered. Three microphones and speakers are dispersed throughout the space. Microphones constantly capture sounds that participants generated, and the frequency (pitch) of generated sound is constantly analyzed in computer software, and finally corresponding sound files of endangered species are triggered. The triggering action can be done both unconsciously and consciously by the participants inside the installation space. These sound files are licensed through and achieved at Macaulay Library of Cornell University which is the largest database of biodiversity audio and video recordings. This sound art installation were once installed in open deck public space at an art event that was held in July, 2015, in order to test and see how random audiences respond to the piece.