1. THE HISTORY OF THE TEXT AND MELODY OF THE GREGORIAN SEQUENCE LAUDA SION. Authors: ÁDÁM MIKE.2. THE HISTORY OF SECONDARY MUSIC EDUCATION IN TWO SIGNIFICANT INSTITUTIONS IN HUNGARY UP TO THE MIDDLE OF THE 20th CENTURY. Authors: ÁDÁM MIKE.3. THE REFORM OF LEO KESTENBERG – KODÁLY PARALLELS IN THE GERMAN MUSIC EDUCATION OF THE 20th CENTURY. Authors: ÁDÁM MIKE.