Emerging from the Berlin underground in 1983, this German electronic and experimental project operated under the names Inandout, IAO and I.A.O. The original line-up consisted of Achim Kohlberger, Ralf Östereich and Carsten Zielske, working in a period when Berlin's post-punk, industrial and experimental scenes were increasingly crossing paths with electronic music and the city's developing club culture.
Achim Kohlberger is the most prominent figure connected with the project. Alongside his musical activities, he became involved in Berlin's wider experimental and electronic network and worked with Dimitri Hegemann around the Berlin Atonal festival and the legendary UFO club. This environment would later feed into the development of Tresor, but I.A.O. belongs to an earlier phase, when the distinctions between experimental electronics, art-rock, industrial music and club-oriented sounds were still fairly loose.
The group's music was based around synthesizers, electronic processing and percussion, but it didn't follow the polished synth-pop formula that was becoming increasingly common during the 1980s. Their recordings combine programmed and played elements, with abstract textures, unusual rhythmic structures and atmospheric passages giving the music a distinctly experimental character. There are also traces of minimal electronics, post-punk and art-rock in the arrangements.
The project went through personnel changes and different phases during its existence. A later period is generally identified as "Phase 3", covering recordings made between 1988 and 1995. This material features Kohlberger, Östereich and Zielske as the central line-up and documents a period when the Berlin underground was changing rapidly, particularly around the collapse of the Wall and the transformation of the city's musical infrastructure.
Tracks associated with this period include “Gospel IV,” “Absublium XX,” “Massiv XIV,” “All Is Bliss,” “Green Earth,” “Feel The Forgotten Sense,” “Hang On,” “Ferns” and “Twinkle Twinkle Little Star.” The recordings move between synthesizer pieces, electronic soundscapes, experimental rock and more rhythmically driven passages, with some compositions having an almost soundtrack-like quality.
The catalogue appeared through several labels and has remained relatively scattered, with releases connected to names such as Interfisch, AKT-Tonträger and Big Sex Records. The use of different versions of the group's name has also contributed to some confusion in discographical listings, where Inandout, I.A.O. and I A O can occasionally appear as separate entries.
A substantial rediscovery came with 'Phase 3', a 16-track double LP released by Melbourne-based Left Ear Records in 2020. The compilation brought together recordings from the 1988–1995 period that had remained difficult to find, making a significant portion of the later I.A.O. material available in a single release.
The recordings collected on 'Phase' 3 cover a broad territory, from sparse synthesizer patterns and atmospheric electronics to angular rhythms, experimental instrumental passages and more spacious pieces. Rather than settling into a clearly defined genre, the material reflects the fluid musical environment surrounding Berlin's experimental scene during the 1980s and early 1990s.









