Spoiled by poor instrumental sound
I'm afraid that this recording, originally from 1967, has not aged well.
The singing is actually very good, but the addition of instruments is a problem. It's a perfectly legitimate move, based on practice in Isaac's time, but the effect here is, to my ears anyway, very unsuccessful because the recording makes the chaumes sound as though someone is playing a loud and distracting kazoo along with the male voices. Frankly, it ruins the whole thing for me; in the brief passages when they are quiet, the performance is rather good, but then they come back in and wreck it again.
I'm sorry to have to say this because Isaac and Senfl are very under-represented in the catalogue so any recording should be very welcome – but not this one, I'm afraid.