🎵 OpenPsalm

As the developer of OpenPsalm, I have spent a great deal of time thinking about how Christians worship through song. OpenPsalm was born from a conviction that congregational singing—specifically, a cappella singing—deserves better tools. My goal is to make hymns and spiritual songs more accessible to churches and individuals who practice unaccompanied vocal worship, especially in other languages, by providing sheet music, exports, and presentation materials that serve the needs of singing congregations.

But why a cappella? The question is not merely one of preference or tradition. It is, at its core, a question of biblical authority and consistent hermeneutics. What does the New Testament actually authorize when it speaks of music in Christian worship?

The Principle of Biblical Authority

Any serious discussion of Christian worship practice must begin with a foundational question: How do we determine what is acceptable in worship? The Scriptures present a consistent pattern in which God specifies the worship He desires, and deviations from that specification are met with disapproval. Nadab and Abihu “offered strange fire before Yahweh, which He had not commanded them” (Leviticus 10:1, LSB), and the consequences were severe. The author of Hebrews tells us that even the angels are warned against usurping the authority God has given them (Hebrews 1:5). The pattern throughout Scripture is that God’s people are to worship according to what He has prescribed, not according to their own innovations.

This principle—sometimes called the regulative principle of worship—asks not “Where does the Bible forbid this?” but rather “Where does the Bible authorize this?” The distinction is crucial. Silence on a matter is not permission; it is the absence of authorization. Put succinctly, “Where the Bible speaks, we speak; where the Bible is silent, we are silent” (Thomas Campbell).

What the New Testament Commands

When we turn to the New Testament for instruction on music in worship, we find a remarkably consistent picture. Every passage that addresses the subject specifies singing—and only singing: (all quotations from the LSB)

• Ephesians 5:19 — “speaking to one another in psalms and hymns and spiritual songs, singing and making melody with your heart to the Lord.” The Greek word translated “making melody” here is psallontes (ψάλλοντες). While this word in classical Greek could refer to plucking a stringed instrument, its New Testament usage consistently refers to singing. The instrument specified in this very passage is “your heart”—not a lyre, not a harp, but the heart.
• Colossians 3:16 — “Let the word of Christ dwell in you richly, with all wisdom teaching and admonishing one another with psalms and hymns and spiritual songs, singing with gratefulness in your hearts to God.” Again, the command is to sing. The purpose is mutual edification—teaching and admonishing one another. This is an inherently congregational activity.
• James 5:13 — “Is anyone among you suffering? Then he must pray. Is anyone cheerful? He is to sing praises.” The response to gladness is singing songs of praise.
• 1 Corinthians 14:15 — “I will sing with the spirit and I will sing with the mind also.” Paul’s concern, even in the period of miraculous spiritual gifts guiding the church, was that worship should be intelligible and engaged—again, an activity for doing that is singing.
• Acts 16:25 — “But about midnight Paul and Silas were praying and singing hymns of praise to God, and the prisoners were listening to them.” Even in prison, the apostolic practice was singing.

In every instance, the New Testament identifies the music of Christian worship as vocal music. Not once does it command, commend, or even hint at the use of instrumental music in the worship of the church.

The Historical Witness

The practice of the early church confirms this reading of the text. For roughly the first several centuries of Christianity, the church worshipped without instrumental accompaniment. This is not a disputed point among church historians. The evidence is extensive:

• Tertullian (c. 197 AD) explained, “each is asked to stand forth and sing, as he can, a hymn to God...” (Apology ch. 39).
• John Chrysostom (c. 397 AD) stated in his homily on Psalm 41, “David formerly sang songs, also today we sing hymns. He had a lyre with lifeless strings, the church has a lyre with living strings. Our tongues are the strings of the lyre with a different tone indeed but much more in accordance with piety. Here there is no need for the cithara, or for stretched strings, or for the plectrum, or for art, or for any instrument; but, if you like, you may yourself become a cithara, mortifying the members of the flesh and making a full harmony of mind and body.”
• Thomas Aquinas (c. 1273 AD) wrote, “But the Church does not make use of musical instruments such as harps and psalteries, in the divine praises, for fear of seeming to imitate the Jews” (Summa Theologica II-II q. 91 a. 2 obj. 4).

Even after instruments were gradually introduced—beginning with the organ in Western churches around the 7th to 9th centuries—significant voices within Christianity continued to object and express reservations to instrumental music in worship:

• John Calvin (1557) in his commentary on Psalm 92, “A difference is to be observed in this respect between his people under the Old and under the New Testament; for now that Christ has appeared, and the Church has reached full age, it were only to bury the light of the Gospel, should we introduce the shadows of a departed dispensation. From this, it appears that the Papists, as I shall have occasion to show elsewhere, in employing instrumental music, cannot be said so much to imitate the practice of God’s ancient people, as to ape it in a senseless and absurd manner, exhibiting a silly delight in that worship of the Old Testament which was figurative, and terminated with the Gospel.”
• John Wesley (d. 1791) is quoted by his biographer as saying, “I have no objection to instruments of music in our chapels, provided they are neither heard nor seen.”
• Charles Spurgeon (d. 1892) often referred to the organ as a “box of whistles” which would spoil the majestic roar of a congregation singing in unison without accompaniment. “And at this day, the sweetest singing in the world is heard in the assembly which utterly abjures the use of every musical instrument” (Sermon #2424, Metropolitan Tabernacle Pulpit).

The Old Testament Distinction

Some argue that because the Old Testament includes instrumental worship—particularly in the Psalms and in the temple service—instruments must therefore be acceptable under the New Covenant. This argument overlooks a critical distinction: the Old Testament also included animal sacrifices, a Levitical priesthood, incense, and a physical temple. The author of Hebrews devotes considerable effort to demonstrating that the Old Covenant has been superseded by the New (Hebrews 8:13). We do not look to the Old Testament for our pattern of worship any more than we look to it for our pattern of sacrifice.

The instruments in the Old Testament were specifically commanded by God through David for use in the temple service (2 Chronicles 29:25). They were tied to the sacrificial system and the Levitical order—a system that was fulfilled and set aside for more glorious instruction in Christ (2 Corinthians 3:7). The New Testament establishes a new pattern, and that pattern is vocal praise.

Why OpenPsalm Exists

A cappella congregational singing embodies the New Testament principle of worship to God in spirit and truth (John 4:24). Every voice is an instrument. Every member participates. The congregation is not an audience listening to a performance; it is a body offering praise together.

This is the conviction behind OpenPsalm. We believe that a cappella congregational singing is not an impoverished form of worship lacking something essential. Rather, it is the form of worship prescribed by the New Testament—rich, full, and complete in itself. What it needs is not instruments to supplement it, but tools to support it.

Many existing hymnals and music platforms assume instrumental accompaniment. Piano reductions, guitar chords, and organ arrangements dominate the landscape. Churches that practice a cappella singing often find themselves underserved by available resources. OpenPsalm aims to fill that gap by providing:

• Hymns arranged for four-part vocal harmony (SATB)
• Multiple export formats (MusicXML, MIDI, LilyPond, PDF) so that song leaders, choir directors, and congregations can use the music in whatever way serves them best
• Aikin shape note support for churches in Christian Harmony and related gospel singing traditions
• Presentation exports for projecting lyrics during worship assemblies
• A growing catalog of hymns that are either in the public domain or freely licensed

Our hope is that by making quality a cappella arrangements freely available, we can strengthen congregational singing wherever it is practiced. The human voice, raised in praise to God, needs no supplementation. It only needs the songs, the knowledge, the opportunity, and (most importantly) the heart to sing.

“Let the word of Christ dwell in you richly, with all wisdom teaching and admonishing one another with psalms and hymns and spiritual songs, singing with gratefulness in your hearts to God.” — Colossians 3:16 (LSB)