"Forgotten Songs" (2011) is a beautiful public art installation by Michael Thomas Hill in Angel Place, Sydney City (just outside the City Recital Hall). The work is comprised of empty and open bird cages suspended above the lane; recorded birds' song; and the names of the birds that once populated the area at the time that Europeans first settled Sydney cove engraved in the paving stones beneath the cages.

Links:

City of Sydney, City Art website