Video duration: 122 seconds
Global video hits: 117565
Please excuse the title in the video, it should be "Shingon".
Buddhist Chants: Harmony of the Soul
http://www.amazon .com/Buddhist-Chants -Harmony-Various-Art ists/dp/B000001KL7
Track 10. Shomyo (Samporai, Jusan)
Video duration: 174 seconds
Global video hits: 54359
The roots of a cappella (and the term itself which means "of the chapel") is Gregorian chant and here from Estonia are Hortus Musicus with a fine example of this early music style.
Video duration: 461 seconds
Global video hits: 149756
This is a rendition of the famous 13th century Latin Catholic hymn, "Dies Irae" (or, "Day of Wrath," about the Second Coming of Christ and Judgment Day). This rendition is off the 1994 CD, "Ego sum Ressurectio," and is difficult to find.