In the realm of Armenian sacred and folk music the name which towers above all others is that of Komitas vardapet (1869-1935). He not only notated the music from oral tradition but also analysed the music of the service, the chants, the psalmody and presented us with its theoretical basis as practiced today. More significant still are his painstaking studies concerning neumes. Eight of Komitas's principle musicological studies have been selected from his Collected Works published in Erevan in 1941. Of these, four are on folk music and four on church music. Two of the studies were published in German and one in French. These have been reproduced in this volume in the original. The papers on folk music describe Armenian folk/country music and dances together with the important plough song of Lori (in north eastern Armenia). The papers on sacred music discuss the Liturgy and tunes sung in the Armenian Church. The studies were first published between the years 1894 and 1914.