This disc follows the musical journey associated with the construction of medieval cathedrals, particularly those of the ecclesiastical province of Sens, France. The repertoire spans several centuries from Gregorian neumes to the polyphony of the Renaissance.

Residents of Sens since 2009, Ensemble Obsidienne breathe new life into the Gothic period and restore the ancient sounds of the mass to a modern day audience.

Contents:
- Lux hodie
- Orientis partibus
- Hec est Clara dies
- Salve festa
- Letemur gaudiis
- Christus manens
- Collocaret
- Stephanus
- Natus est
- Lux opta claruit
- Recette de saugé
- Orientis partibus
- Roman de Fauvel: I J'ai fait nouveletement amie
- Roman de Fauvel: II Douce Dame debonaire
- Roman de Fauvel: III Bon vin doit
- Gloria ad modum tubae
- Nowell
- Laudiam l'amor divino
- Verbum caro factum est
- Riu riu
- Uns kompt ein Schiff gefahren
- Nova nova
- Nova vobis gaudia
- Et enim sederunt
- Sederunt principes
- Saint Loup
- Sainte Colombe
- Video coelos: I Alleluia
- Video coelos: II Communion
- Stella nuova'n fra la gente
- Reges Tharsis
- Angelus
- Ante luciferum
- Kyrie
- Crudelis Herodes