Air Liquide is a German electronic band composed of Ingmar Koch (a.k.a.

Koch and Oral continued to record together under the pseudonyms Madonna 303[2] and Jammin' Unit & Walker.

[4] After a variety of jam sessions in Koch Studio, the duo released Neue Frankfurter Elektronik Schule.

Lyrics and vocals for some songs was contributed by Koch's former girlfriend Mary Susan Applegate.

The band broke up in 2005 after the previous year's album Let Your Ears Be the Receiver.