Soon after working with Michael Cretu on the first Enigma album, German producer Frank Peterson left the project in order to focus on Gregorian, a band that performs mostly covers of modern pop and rock songs with Gregorian-like vocals and symphonic instruments [REF].
More electronic projects that often draw comparisons with Enigma are French act Deep Forest,[REF] Canadian duo Delerium,[REF] Danish project Achillea (created by Enigma's co-producer and guest guitarist Jens Gad)[REF] and German project Schiller [REF].