Air Liquide is a German electronic band which is composed of Ingmar Koch (AKA "Walker") and Cem Oral (AKA "Jammin' Unit") which was formed in 1991 in Cologne, Germany. 1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar. ... Köln redirects here. ... A music genre is a category (or genre) of pieces of music that share a certain style or basic musical language (van der Merwe 1989, p. ... Falling under the encompassing umbrella of Electronic Music, and the subsequent smaller grouping of house music, Acid House generally uses simple tone generators and tempo-controlled resonant filters. ... Ambient music is a loosely defined musical genre that incorporates elements of a number of different styles - including jazz, electronic music, new age, rock and roll, modern classical music, reggae, traditional, world and even noise. ... Trance is a style of electronic dance music that developed in the 1990s. ... Experimental music is any music that challenges the commonly accepted notions of what music is. ... This article or section does not cite its references or sources. ... 1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar. ... Köln redirects here. ...