We tend not to associate the word "hallelujah" with those penitential seasons. In Christ on the Mount of Olives it signifies the climactic moment when Christ says, "Not my will, but ours, be done" (Luke 22:42). This is when he commits himself to his passion and death on the cross. That, in turn, will lead directly to the triumph of Easter. Now that calls for a "Hallelujah!"
Kyrie from Beethoven’s Missa Solemnis
When we think of Beethoven, Sacred Music might not be the first thing that comes to mind . . . but what he did compose was, as we might expect, moving, powerful, and simply beautiful.