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P16.D4 was a German electronic noise music collective, active primarily from 1980 to 1988. P16.D4 embraced tape cut-ups, musique concrète, endless recycling and transformation of previously published material, and many long-distance collaborations with like-minded artists such as DDAA, Vortex Campaign, Nurse With Wound, and Merzbow. Their active participation in the international industrial tape scene yielded collaborative output such as their release Distruct, where bands such as Nurse with Wound, Nocturnal Emissions, Die Tödliche Doris, and The Haters provided the source material. The longest-term collaboration was with the installation and conceptual artist Achim Wollscheid, who used P16.D4 sounds as the basis for LPs he recorded under the name SBOTHI. Ralf Wehowsky, the only constant member of the group, later released solo material under the alias RLW.
Members of P16.D4 were also involved with Selektion, a collective of people involved with sound as well as the visual arts. Selektion published LPs, CDs, books, visual art and design.
The collective worked in a strongly improvised, spontaneous and anti-professional way, using acoustic and electronic instruments, using existing sound fragments, duplicating and alienating them, using repetition, distortion, changes in speed and playing direction. For this they used not only sounds of other artists but also their own material from earlier productions. Late works of the collective are associated with musique concrete.