Listen to In Festo Purificationis B.M.V.: Offertorium (Diffusa est) online. In Festo Purificationis B.M.V.: Offertorium (Diffusa est) is an English language song and is sung by Karel Frana and Boni Puncti. In Festo Purificationis B.M.V.: Offertorium (Diffusa est), from the album Voices of Chant, was released in the year 2010. The duration of the song is 0:45. Download English songs online from JioSaavn.