Anonymous 4 explores the theme of the Pentecostal power of the "Fiery Spirit". Hildegard′s intensely emotional chants and visions (including the monumental hymn ′O ignee spiritus′ and some of her finest antiphons) are presented here framed by hymns and sequences that she and her convent sisters would have heard and sung every day.

"This is the finest Hildegard recording ever made." (Fanfare)
"Une exquise douceur vocale... charme quasi hypmotique." (Le Monde de la Musique)
"These singers... seem to have the most instinctive grasp of Hildegard′s wide-ranging, quirkily chromatic, extravagantly melismatic music. They capture her fevered lyricism in masterly fashion, with their characteristic intelligence, suppleness, spontaneity and quality that can only be called spiritual affinity." (The New York Times)