Frere Jacques was a year-round, um, round, so it was imprinted more strongly and more regularly on me. I definitely remember singing it with other children in pre-school. On the other hand, I was not expected to memorize Adeste Fideles, since it was seasonal and was written in the hymn book and caroling books. I don't know which I was exposed to first, since Mom definitely sang Frere Jacques to/with me before pre-school, and I definitely heard Adeste Fideles at church and from neighborhood carolers.
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