[1] In 1998, Peterson and his team of Jan-Eric Kohrs, Michael Soltau and Carsten Heusmann re-invented the project to perform popular songs in the Gregorian style.

Twelve vocalists - previously acclaimed session and choir singers - were then hired to record the tracks.

Known as the ten "Chapters", said album releases primarily featured covers of well-known or popular songs (ex.

Phil Collins' "In the Air Tonight", Alphaville's "Forever Young"; Celine Dion's "My Heart Will Go On", etc.)

Gregorian has toured parts of Europe, China, Russia and Japan; according to one report, the band has performed over 3,000 concerts in 106 countries to 12 million fans.