Yes, I would dearly love to be unpredictable, but I had the good fortune to hear an all-male schola sing the "Dies Irae" at Mass yesterday, and remembered just how much I liked it. Perhaps it is the rhyming scheme that sets it apart from most other long Gregorian pieces; this four-line structure makes it a bit more song-like, to my ears, rather than pure chant. Then again, there is the modal structure, which, I am told is a combination of the Dorian and Hypodorian modes. . .(Don't take this to mean I know the first thing about modes; I am just parroting what I read). Whatever the cause, I have always found it a most impressive piece. Sobering, to be sure, but impressive. Here is a solo version by an Italian singer named Giovanni Vianini who directs a Gregorian schola.