No obvious answers came to me during my 10 days away, but I am still slowly chewing through the notes I took and something might emerge when that process is done.
Between that and heat waves and renovations, the only character to have shown up with sufficient humour and interest to get the creative juices flowing has been Bishop Stumbers, and he has been greatly assisted by convoluted Twitter threads that would take far too long to explain properly.
Palestrina is a really big name in sacred choral music, and has been for a few centuries. The music he composed for Christmas Day Mass is particularly beautiful and inspiring. (Hodie Christus Natus Est = Today Christ is Born)