The following historical information derives from:
1) "Ιστορική επισκόπησις της βυζαντινής εκκλησιαστικής μουσικής από των αποστολικών χρόνων μέχρι των καθ΄ ημάς (1-1900 μ.Χ)" (1890) by Georgios I. Papadopoulos,
2) "Βυζαντινή Εκκλησιαστική Μουσική και Ψαλμωδία, Ιστορικομουσικολογική Μελέτη", volume 1 (1992) by Phillipas Economou
Ioannis Chaviaras was the first recorded musician to harmonize Byzantine chant as early as 1844 when he was the Protopsaltis of Holy Trinity Church of the Hellenic Community of Vienna. Deacon Anthimos Nikolaidis, a contemporary of Chaviaras, published a three volume works with harmonized Byzantine Music (Musical Anthology) around that time. He also taught this music in the Athens Rizareion Seminary prior to his passing in 1865. At the same time period, in London, Nikolaos Kyvos was also active in harmonizing Byzantine music.
These individuals and their works predated the influences of Katakouzenos, Sakellarides and their contemporaries.
The Church of Greece, the Ecumenical Patriarchate and many learned societies mounted vigorous responses starting with the pre-emptive move by the Greek State followed by damning edicts by the Ecumenical Patriarchate and the Church of Greece.
The first documented pre-emptive move, in 1837, was made by the Greek state. Receiving reports about the Viennese harmonised influences on the churches in that part of the world and receiving reports about the slow but steady influx of these influences on churches in Greece, the first school of chant was founded by imperial decree (King Otto). Zafeirios Zafeiropoulos and Deacon Theoklitos, starting in 1837, taught Byzantine music to many students who subsequently filled numerous empty churches.
The first strongly worded edict was in 1846 by Patriarch Anthimos in direct response to the activities of Chaviaras (p. 209 footnote in Papadopoulos).
Katakouzinos did not come to the scene until 1870. His activities and his teaching elicited draconian and quite violent responses by Greece's Holy Synod, men of letters, learned societies and newspapers.
The most prolific individuals at that time who were instrumental in attenuating the entry of harmonized Byzantine music into church life were Dimitrios Vernardakis, Archimandrite Eystathios Thereianos, the Metropolitan of Syros and Tinos Alexandros. Indeed, they were key in the prevention of Katakouzinos and harmonized Byzantine music into the Metropolitan Cathedral of Athens.
Nevertheless, harmonized Byzantine chant did enter churches in Patra, Kalamata, Peiraias and other churches in Athens.
This forced the Holy Synod to issue edicts in the late 1870-early 1890s. Spearheading these efforts were the bishop of Patras and Ileias Cyril as well as the music teacher Panagiotis Agathokles.
Konstantinos Psachos was dispatched by the Ecumenical Patriarchate to Athens to found a school that would counter the dissolving of Byzantine music and its evolution into something out of line with the established practices and traditions of the psaltae of Constantinople, mainly the traditions of the Ecumenical Patriarchate. Psachos established the School in 1904.
A number of other Schools along the same lines were founded soon thereafter (Hatzitheodorou in 1933, Margaziotis in 1933, the Society of Friends of Byzantine Music in 1948 and a school in Thessaloniki in 1948, and many others subsequently)
Karas was born in 1903 and could not have participated in the critical years of the battle against harmonized Byzantine music.
Indeed, his interest in Byzantine music did not begin until 1921 and then formally in 1929 when he founded the Society For the Preservation of National Music and then with a primary interest in transcribing and recording Greek folk songs. Byzantine Music was of secondary importance to Karas at the time.
Psachos, Margaziotis and Hatzitheodorou as well as multiple Holy Synods of the church of Greece were already active against harmonized music much earlier (see above).
NG