[3] Tahmizian's discoveries in the area of the medieval Armenian notational system open a door to understanding and interpreting the liturgical chants (sharakan)[4] of the period.

He explained the uniqueness of the Armenian oktoechos and shed light upon the conceptual and aesthetical issues of the medieval music of Armenia.

[10] Moreover, he brought into focus the specific characteristics of the Armenian modes as compared and contrasted with Persian, Arabic, Turkish, as well as Greek, Russian and Caucasian modal systems.

[11] Throughout his career, Tahmizian published over a dozen books and around two hundred articles and essays in Armenian, Russian, English, French and Polish.

He has also delivered over 60 academic lectures in universities and conservatories throughout the former Soviet Union, as well as London (1978), Rome (1981), Tokyo (1985), Paris (1989), San Francisco (1990) and New York City (1993).

From 1956 to 1960 he completed his post-graduate studies at St. Petersburg State Conservatory under the mentorship of renowned music scholar Christopher Kushnarev.

During the same period he actively collaborated with the Composers' Union of Armenia, Yerevan Komitas State Conservatory and the Armenian National Academy of Sciences.