Selected movements from the world premiere of "Requiem"
University of Glasgow Chapel Choir, directed by James Grossmith, with Andrew Forbes at the organ.
"Thou Knowest, Lord" for SSAA is published by MusicSpoke: https://musicspoke.com/downloads/thou-knowest-lord

Thou Knowest, Lord, The Secrets Of Our Hearts

Give this a listen if you're interested. It contains three tetrads, played using sampled tuning forks with some distortion. They have slow beating, as if they have at least one near-just interval, and yet none of the subset triads (or dyads) exhibit any beating. How is this possible?

1. In 12-EDO, 0-1100-1700-2200, followed by its four subset triads and then played in full again. A3-G#4-D5-G5

2. 0-1812-2622-3212, followed by its four subset triads and then played in full again.

3. 0-1002-1444-1951, followed by its four subset triads and then played in full again.

4. Music for Bent Tuning Forks (in 12 EDO). It contains some such tetrads.

Notice that in each case the full tetrad has slow beating while all of the triads are beatless.

The Conundrum of the Bent Tuning Forks

DMgUILLOTINE