The authors follow a 1975 soundwalk through old Salzburg, Austria, forty years after its creation, reflecting on issues of sonic lasting, transience, accessibility and futurity.

Of the works of David Tudor, none would seem to be better known than Rainforest IV , his large-scale performed installation of the 1970s. Although it has received widespread and well documented public performance, Rainforest 's germination in the mid-1960s in elements of Bandoneon! (1966) and its evolution over a period of 10 years, from versions I (1968), II (1968–1969), III (1972) and IV (1973) through Forest Speech (1976), have not yet been adequately assessed. This paper follows Rainforest 's trajectory chronologically: Matt Rogalsky focuses on the early versions of the work, and John Driscoll describes the collaborative development of Rainforest IV .