Just a note:
Taso posted a link to the Lingas Sakellarides article. The link was to my diocese's website, as I had it posted there. It was not particularly flattering to Sakellarides soi-disant reforms, nor was my intention of having it posted. The site has been moved and the correct link should be:
Dr. Giannoukakis also cites condemnations of 4 part polyphony in liturgical usage. The one that comes to mind and was reposted on our diocesan site is that of Patriarch Anthimos, and is the most germane to anyone who cares:
The article for Sakellarides is very well written indeed. In the same website I found some byzantine melodies in English that did impress me, although the composer used some old signs (something to which I firmly oppose!) and his orthography (both of Greek texts and of byzantine notation) did contain some errors.