Sequential One was started in 1993 by German producer André Tanneberger, getting the name from the Sequential Pro One synthesizer. In 1994 three more members joined: Morpha on vocals, producer Ulrich "Spacekid" Poeppelbaum and Dutch producer Woody van Eyden. Woody and Morpha left in 1998. In 1999 the last single was released. As the House Nation label owned the Sequential One name, André and Uli continued the project as SQ-1 on Kontor Records.
André Tanneberger , under the stage name of ATB, (born February 26, 1973 in Freiberg, Saxony, Germany) and 2010, and #15 in 2011. He is best known for his 1999 single "9 PM (Till I Come)" which was a number one single in the United Kingdom.