I'm surprised at TCJ's statement above that he doesn't care if people don't sing during communion. Besides the liturgical question of singing during communion, I'm concerned about the musical effect. A lonely organ playing a 16-bar strophic melody. Hardly worthy music. Especially when there are so many glorious antiphons, chants, and motets that could be sung if the congregation will not join in the hymn.
From there on people have been able to figure out how to read the board.
...is there anyone out there who doesn't understand what the numbers on a board in front of a church mean?
Simple and clear, do not draw a whole bunch of attention to yourself.
I also agree with CharlesW, although it makes for very boring liturgy if you're the lone organist playing 4 masses every weekend.
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