>mfw Missa et ecce terrae motus and heth from lamenatations

https://www.youtube.com/watch?v=zvMGMW47gs0&list=RDzvMGMW47gs0&start_radio=1
https://www.youtube.com/watch?v=fJX_hO9DBn4&list=RDfJX_hO9DBn4&start_radio=1


What did those Franco-Flemish know that we don't?