Researching this has been interesting. The LSB in its Divine Services and prayer offices substitutes out Alleluias in Advent. It makes sense to me because for some of us Advent is considered a penitential season, less penitential than Lent, of course.

Digging a little deeper, such as the resources at Lex Orandi, one finds that Dr. Piepkorn’s The Conduct of the Service states that the Alleluia is only removed during Lent. Given this I am now curious as to how the change occurred for Advent in the LSB, but I imagine the why would not be a shock. I don’t have any older hymnals to check this against, nor do I have an Altar Book.

Thank you for the info about the ELH — “The Church” in the third paragraph now appears to be an overgeneralization.

Pastor Snyder of Ask the Pastor has interesting commentary regarding the practice for Lent that easily goes for Advent:

Should it be done? That is in the realm of freedom under the Gospel. Many Lutherans do omit the Alleluia during Lent, often using a burial service such as the one you mention. Martin Luther would probably have disagreed. He wrote, “Nor is it proper to distinguish Lent, Holy Week, or Good Friday from other days, lest we seem to mock and ridicule Christ with half of a mass and the one part of a sacrament. For the Alleluia is the perpetual voice of the church, just as the memorial of His passion and victory is perpetual.”

So, without trying to be contentious, I did re-read your post and found that your words to your children did not convince me that the ‘Alleluia’ should be omitted during the Advent season.