On: every psalm and song in the daily prayers uses today’s English. Off: all of them use the older “thee and thou”. Until you choose, the Songs of Zechariah, Mary and Simeon use today’s English, as most churches sing them. The Lord’s Prayer and the prayers for the dying show the form most people learned.
The day of Christ's crucifixion. Stripped of ornament, often observed with the passion according to John and the bidding prayer. No communion is celebrated in most Lutheran practice.
In Church year — Seasons, festivals, and the calendar that orders them.