Pax! How do you remember the chants/hymns and organ accompaniments? Do you have a special technique or is this just not important for you? Do you find remembering church music different from remembering other kinds of music?
Are you talking about sitting in the pews or sitting in the choir and remember hearing particularly good accompaniments, or are you talking about playing from memory?
Memorization has been more difficult for me as my sight singing skills have improved and I rely less on muscle memory.
I still try to memorize things, as it helps free musicality, especially if I'm directing. And it's a great bonus that memorization also helps keep the brain sharp.
I have stopped memorizing Sunday music. It changes to fit the liturgical year, so it isn't an economical use of time to memorize pieces I wont use again for a year.
I have looked suspiciously upon memorizing music since I heard an anecdote about the Julliard String Quartet falling on its face trying to sight read a piece written for them in front of an audience - they spent so much time memorizing and playing memorized music they basically forgot how to read.
In church playing, when you might be called upon at a moment's notice to sub for a colleague with flu, and having to possibly play unfamiliar music at a moments notice, sight-reading skills are (to my mind) much more important.
Having said that, If you are going to use, say, Sanctus XVIII per omnia saecula saeculorum, you might as well commit it to memory to save having to have another book fall off the music rack during Mass.
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