Karlheinz Stockhausen - Spiral (Realization A)

Spiral, for soloist with shortwave receiver (1968) Eberhard Blum, flute, voice, shortwave receiver This 1968 composition by German spaceman Karlheinz Stockhausen is one of his least musical and most interesting. Written for a single performer and shortwave radio receiver (at least two microphones and loudspeakers are necessary for execution and playback respectively), Spiral consists of a series of “events,“ recorded in four “realizations.“ All but the first can contain any combination of lack thereof of