Enigma is an electronic musical project started by Michael Cretu, David Fairstein and Frank Peterson in 1990.

Cretu is both the composer and the producer; his wife Sandra often provides vocals on Enigma tracks. The pair have also worked together under the name Sandra. Six studio albums have been produced under the name of the project.

On August 28, 2005, Enigma's management (Crocodile-Music.de) announced the release of the project's latest single, "Hello and Welcome".

The single was originally slated to be released in October, however it was moved to November 25, 2005 and finally saw release in Germany on March 10, 2006.

The song will also be the walk-in music for the German boxer, Felix Sturm, and much like Voyageur shows little similarity to earlier Enigma works.

On September 26, 2006, Enigma's sixth album A Posteriori was released worldwide, containing a new version of "Hello and Welcome" and the new song "Goodbye Milky Way", which, despite earlier announcements, was and will not be released as a single.

The album is more techno, electronic, than any previous one. The concept is based on such sciences as astronomy, physics, history and sociology.