This morning I discovered more psalm recordings on two different websites. As far as I can tell, they have been there for a while, or at least long enough for my dear brother to have already known about them. Why am I always the last to know about these things? :)
The recordings posted on Middletome are older recordings, so the sound quality is up and down. And each file has multiple psalms on it, not identified in the file name, so you won't know what you're getting until you listen. But still, psalm recordings. :)
The recordings on cambl.com are more recent and therefore of higher quality, and they are neatly listed and identified by psalm and tune. I have added those psalms to the list in this post.