GJ. I did wonder if you'd reply to my (#13) sweeping generalisation! Another way of putting it is that if any music student in the 3rd quarter of the 20th century served up a concatenation of nice-sounding chords as his/her composition exercise, it would have been laughed off the campus. I do not say that was a good thing, but maybe we have forgotten what 'difficult' is for singers. The Part canticles may be 'difficult' in the sense of sustaining a tight performance, but notewise? Surely not. Some may remember the John Alldis singers who tackled some fearsome repertory. And maybe we should celebrate a present-day group such as Exaudi which is not afraid to programme and perform stuff which is challenging both for them and their audience.