Why vocal only and not instrumental? 

Why vocal only and not instrumental?

The Stance of Christianity Towards Instrumental Music

Holy Scriptures make clear references to the use of instruments in worship: “Praise Him with timbrel and dance; praise Him with strings and flute.”

Given this very eclectic and rigorous attitude, and contrary to earlier practices of Jewish worship, musical singing became accepted but instrumental music in Christian worship was forbidden.

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Saint John Chrysostom (in his commentary on the Epistle to Colossians, PG Migne, V62, Col. 306).

«We must see what follows. For, there [among them] there are flutes and strings and pipes, but here [among us] there is no discordant melody. But what exactly [is there]? Hymns and psalmody. For there [among them], the demons are praised, but here [among us] God the Lord of all”

«Ἀλλὰ δὴ τὰ μετὰ ταῦτα ἴδωμεν. Ἐκεῖ μὲν αὐλοὶ καὶ κιθάραι καὶ σύριγγες, ἐνταῦθα δὲ οὐδὲν ἀπηχὲς μέλος. Ἀλλὰ τί; ὕμνοι, ψαλμῳδίαι. Ἐκεῖ μὲν οἱ δαίμονες ἀνυμνοῦνται, ἐνταῦθα δὲ ὁ πάντων Δεσπότης Θεός.»

Saying Attributed to Elder Pambo

«When I went away to Alexandria I saw the ranks of the church and how they sing and I became very sorrowful because we do not sing canons and troparia.' The elder said to him: 'Woe betide us, my son, for the days have arrived in which the monks will abandon the solid food spoken of by the Holy Spirit and go running after songs and tones. What kind of sorrow for sin, what tears are born of the troparia? What kind of sorrow for sin is there for a monk when, standing in church or cell, he raises his voice like the oxen? If we are standing before God, we ought to stand in great sorrow for sin, not being elated. For the monks did not come out into this desert to stand before God and be elated, to warble songs, shape tunes, wave their hands and prance around on their feet. Rather ought we to offer our prayers to God in great fear and trembling, with tears and sighs, with reverence, in a thoroughly repentant, moderate and humble voice, well disposed to sorrow for sin.» 

Source: The Anonymous Sayings of the Desert Fathers. Cambridge: Cambridge University Press, 2013), 616-619, (no. 758 BHG 2329b): For more details: http://www.eschatologia.com/2020/07/concerning-alleged-prophecy-of-abba.html