According to Wikipedia, “…the Speciálník Codex (CZ-HKm MS II.A.7) is a 15th-century speciálník (i.e. special songbook) originating from a monastery in the region of Prague.” It is considered something of a ‘missing link’ between medieval and Renaissance music and it features several rather unknown Czech composers. The Hilliard Ensemble sing pieces from this book so elegantly that I almost forgot about my classes this evening. After a rather traumatic week, this was pure balm for my ears, mind and soul.
Though you can find it at your favorite CD shop, you may want to consider ordering this through Qobuz as a download, as the sound is exquisite.