A service of Tenebrae will be webcast live from St. Thomas Church starting in about 35 minutes; the audio file will be available for at least a week afterwards as well.
I will be adding information here about the Office of Tenebrae in the near future. Meantime, listen to excerpts from the Hilliard Ensemble's recording of the Gesualdo Tenebrae, which are simply astounding, even in 30-second clips. There are 27 Responsories, plus the Benedictus and the Miserere.
Set the player at "Preview All" and prepare to be transported. While you're over at Amazon, read the long comment by "Johji Josquin" for everything you ever wanted to know about Gesualdo, and more.