According to Asmus Tietchens' web site, "Kontakt Der Jünglinge 1" was recorded in the '"Lagerhaus" in Bremen, Germany in 1999. I've witnessed a number of live improvisations with sound and noise in which some unexpected event outside the performance space occurred, such as an ambulance passing by with a loud siren. The performers would typically accept the additional source material and work it into their piece.
In this case it's not a siren, but rather a distant throbbing beat of what must be a band performing or a disco upstairs or next door. I can only guess that the "Lagerhaus" is a nightclub, or adjacent to one, although it's also possible that this sound is a sample brought to the performance by one of the artists. That's part of the charm of listening to a quality recording of a live performance: you don't quite know whether the whole thing was done on a laptop with digitally-stored sounds, or whether the artists were collecting ambient sounds from the performance space, treating them, then releasing them back into the space as part of the performance. This recording definitely sounds like the latter. The deep throb of a distant disco drifts into the piece several times, and sounds so natural. But the beat appears only in small sections, while the overall 45-minute piece is mostly dense with wind and whooshing sounds. If you like your sound a bit more sparse, listen first to Kontakt der Jünglinge 0 (see below).
 
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