52 Among the oldest and most outstanding monuments of sacred music the liturgical chants of the different eastern rites hold a highly important place. Some of the melodies of these chants, modified in accordance with the character of the Latin liturgy, had a great influence on the composition of the musical works of the Western Church itself. It is Our hope that the selection of sacred eastern rite hymns - which the Pontifical Institute of Oriental Studies, with the help of the Pontifical Institute of Sacred Music, is busily working to complete - will achieve good doctrinal and practical results. Thus eastern rite seminarians, well trained in sacred chant, can make a significant contribution to enhancing the beauty of God's house after they have been ordained priests.
Source: Musicae Sacrae (Vatican.va)