Sound hunters were amateur sound hobbyists who, from the 1950s, started to form clubs, national and international organisations, to produce radio programmes, and to organise national and international contests. Such hobbyists have been active since the beginning of sound recording technologies, but it was with the advent of tape recorders that the movement grew to a large scale. This chapter will present the work of French and British sound hunters who experimented with the tape recorder. As early as the 1950s, using this newly available technology, they started to make sonic experiments, sometimes with home-built machines: recording of very faint sounds, musique concrète, field recordings and soundscapes, and sound collages comparable to what Fluxus artists would do decades later. It is therefore an alternative history of musique concrète and field recording that this chapter will present, through people who are usually absent from history books.