A reader suggested this last night, so I saved it for this morning: O Sacred Head Now Wounded, by Johann Sebastian Bach.
This was another one we sang in seventh-grade chorus. Let me see if I can remember the words.
O sacred head, now wounded, with grief and shame weighed down
Now scornfully surrounded, with thorns thine only crown
O sacred head, what glory! What bliss till now was thine
Yet tho’ despised and gory, I’d joy to call thee mine…