Cem Oral, also known under his pseudonyms Jammin' Unit and G 104, is a German musician, label owner and mastering engineer.

With Koch and Jörg Burger, he founded the music label Blue in 1992, in which, among other publications of its own projects such as Air Liquide, M.F.A., H.E.A.D., G.E.F.

In 1995 he founded, with his Ultrahigh bandmate Roger Cobernus, the label Pharma which is based out in Frankfurt, on the next production of the two operators also works the artist DMX Krew and Bad Street Boy appeared.

With Adel Hafsi and Cem Oral founded the project UMO (Unidentified Musical Objects), which released three albums between 1996 and 2000.

He worked with the musicians Wu-Tang Clan, Michael Rother, George McCrae, Black Eyed Peas, Gwen Stefani, Nine Inch Nails, Mad Professor, Coldcut, stereo Total, Mark Stewart, Daddy Freddy, Prong, Holger Czukay, FM unit, The Shamen, BVSMP, Captain Comatose, Oscar Sala, Kerosene, skin, Vapourspace, Caspar Pound and Jay Haze.