A worldbeat dance fixture of the late 20th century and beyond, having sold tens of millions of albums worldwide, Enigma were an instant success with their unlikely combination of new age tones, chilled-out club production, and samples of Gregorian chant. The project arrived with their 1991 single "Sadeness (Pt. I)," which immediately became an international hit and the calling card for their unique sound. Over the next three decades, Enigma would release upwards of eight albums and collections, many of which spent time in the Billboard charts. Enigma were formed in 1990 by Bucharest native Michael Cretu. He had been involved in music for a while at that point, having released several solo albums as well as worked as a producer with other artists.