The band members started in the beginning of 60's, working in different bands in 60's and 70's, Rolf Köhler worked for several different artists such as Blonker, Uriah Heep, Blind Guardian, Helloween, Grave Digger, Gamma Ray, Iron Savior, Savage Circus, Tokyo, Mephistopheles, and Kin Ping Meh (featuring Geff Harrison) among others.
Systems in Blue je nemška pop skupina, ki je bila originalno sestavljena iz članov; Rolf Köhler, Michael Scholz in Detlef Wiedeke.