The two brothers, Martin (Marshall Mar, a.k.a. Martin Jekyll) and Christian (Luxus Chris a.k.a. Christian Hyde) form the HipHop group "Stieber Twins". Their HipHop activities started in the mid 80's during their high-school years. Besides their music both have been active in graffiti and breakdancing.
The Twins' muscial career started in the 90's with the appearance of the track "Graffiti interlude", an instrumental, on the Mzee Sample "Alte Schule" in 1993. Another instrumental, "Breakers revenge", also marked the entrance of the two brothers into German HipHop music.