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On this day in 1980 EINSTÜRZENDE NEUBAUTEN crawled into a pillar of Berlin's Stadtautobahn bridge and recorded Stahlmusik.
The space was 1.5 metres high, 5 metres in width and 50 metres in length and made out of steel. Pocket torches were used to lit the place and a Telefunken Bajazzo transistor radio was used as amplifier. The session was taped with an ordinary cassette recorder.
- Fromthearchives.com
You can see the recording space on the film Liebeslieder when EN returned a year later.
At the end of this video...
Liebeslieder - Armenia
...and the beginning of this video:
Liebeslieder - Hör mit Schmerzen