
1) British choir 2) Holy Week ceremony
Found on
https://www.crosswordclues.com/clue/tenebrae

Tenebrae (Latin for `shadows` or `darkness`) is a Christian religious service celebrated within Western Christianity on the evening before or early morning of Maundy Thursday, Good Friday, and Holy Saturday, which are the last three days of Holy Week. The distinctive ceremony of Tenebrae is the gradual extinguishing of candles while a series o...
Found on
http://en.wikipedia.org/wiki/Tenebrae
[soundtrack] Tenebre is the soundtrack to Dario Argento`s film of the same title, first released as an album in 1982, and reissued most recently in 2006 with multiple bonus tracks. The score was composed and performed by three former members of the defunct rock group, Goblin, who briefly reunited at the request of the film`s director. Altho...
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http://en.wikipedia.org/wiki/Tenebrae_(soundtrack)

• (n.) The matins and lauds for the last three days of Holy Week, commemorating the sufferings and death of Christ, -- usually sung on the afternoon or evening of Wednesday, Thursday, and Friday, instead of on the following days.
Found on
http://thinkexist.com/dictionary/meaning/tenebrae/

(from the article `canonical hours`) Very important in the 16th century were the settings of Matins and Lauds for Thursday, Friday, and Saturday of Holy Week during the service of ... Another medieval custom, which has had a popular revival in the late 20th century, is the service of Tenebrae, held on Wednesday, Thursday, and ... [2 ...
Found on
http://www.britannica.com/eb/a-z/t/24
No exact match found.