First track "IV Chapter" is actually some kind of remix of Enigma's "Second Chapter". All other tracks have nothing to do with Enigma, although they were produced by other artist. One of the artists featured on Enigma IV - Metamorphosis is an artist named Anggun. There are two tracks here by her, "Snow of the Sahara" (originally "Snow on the Sahara"), and "By the Moon". They are off of her self-titled album Anggun. She is an Indonesian artist who lives and records in Paris, and in my opinion, worth checking out.
Additional info: (Track list with Comments)
1) IV Chapter - mixed fragment from Enigma 2 ('The CROSS of Changes') 2) Light Of Your Smile - from Enigma's "Beyond the Invisible" single, with some gregorian chants added 3) Metamorphosis (by Culture Beat 'Metamorphosis' album) 4) Start To End (by Software 'Heaven to Hell' album) 5) Responsorium I 6) Snow On The Sahara (by Anggun 'Snow On The Sahara' album) 7) Sensing The Spheres (by Venja 'A Dash Of Soul' album) 8) Black Moon Dance (by Venja 'A Dash Of Soul' album) 9) By The Moon (by Anggun 'Snow On The Sahara' album) 10) Responsorium II 11) Ancient Person Of My Heart (by Divine Works 'eponymous 12" single) 12. Ancient person of my heart (Le Tonnere dance mix)