In 1791, his last year, Mozart composed Ave verum corpus for the feast of Corpus Christi in Baden, while he was writing The magic flute.

The Sixteen, with Harry Christophers, make fine exponents:

Sotto voce throughout, its stately, intense simplicity reminds me of Härlig Är Jorden.

I don’t learn as much from this 1902 recording of the Sistine Chapel as I would like:

For Byrd’s Ave verum corpus, see here.