Hungaraton's Codex Sanblasianus: Medieval Mass for the Feast of the Annunciation is a rather mysterious entry for a number of reasons. One will look in vain for the title "Codex Sanblasianus" anywhere outside the context of this disc, and that raises a red flag as to exactly what manuscript János Mezei and the Schola Cantorum Budapestiensis is referring. It is British Museum Add. 27630, a South German manuscript from the second half of the fourteenth century.