I am joined in this episode with my youngest son. Sequences are designed to be sung between two people or two choirs, or a leader and choir, alternating the parts for variety and help the singers last the distance.

The corresponding page from my hymnbook's webpage is here:

https://newbookoldhymns.brandt.id.au/hymns/diesirae.html  

For more info on classical and popular allusions, here's an article I wrote a while ago for Corpus Christi Watershed:

https://www.ccwatershed.org/2014/05/17/gregorian-chant-star-wars/

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