This Sunday I'm going to use this newly published piece from OCP. It's marketed as an Advent/Christmas song, but I think it has wider application, such as for the Feast of the Transfiguration:

https://youtu.be/n4m6WJ10Wyc

It's chant-like, it's simple polyphony, and it's scriptural.

Then you're no better than Rory Coony who also tried to shock people's sensibilities with his "I myself am the bread of life, you and I are the bread of life" lyric.

There is no darkness in God nor in his love, as attested to by Scripture:

"Now this is the message that we have heard from him and proclaim to you: God is light, and in him there is no darkness at all." (1 John 1:5)

I'm well acquainted with The Cloud of Unknowing, and the spirituality of St. John of the Cross, and the night of sense and the night of spirit that he describes.

There can be an experience of darkness when God withholds consolations and a soul experiences spiritual dryness. However, that is not a darkness of God's love; it is a darkness of the experienced/apparent absence of God's love, which love is still present but not in the manner the soul has been accustomed to experiencing it previously because God is inviting the soul to a deeper conversion that is less reliant on pleasurable sensible feelings or comforting spiritual consolations.

I don't think songs with a lyric that directly contradicts Scripture should be sung in the Church's liturgy, and they probably should not be sung in public, informal devotion either.

I know what you're trying to convey, but I think your lyric fails to convey it adequately because it doesn't distinguish between God's love and the experienced absence of God's love, so it could mislead people.

Liturgy is not the place for expressions of apophatic spirituality. In apophatic theology and spirituality, darkness is a darkness of ignorance about God on the part of the human knower, not a darkness in God himself. Apophatic theology and spirituality state that God is always more unknown to the human intellect than he is known, so we approach him in ignorance, or in a type of darkness. But the darkness is only apparent because God himself is supremely, infinitely intelligible; it's just that his infinite intelligibility far exceeds the capacity of our finite, created intellects to grasp.

Mysticism, by its nature, is not liturgical because mysticism is individually and privately experienced whereas liturgy is public, communal prayer.

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I don't think Adam's terminology is one that I would use (though I think I understand why he used it). I am just mindful of the need to share our perspectives charitably.

St. Augustine writes extensively about the meaning of darkness in Genesis in Book XI of City of God, as a symbol of deprivation of the light of God’s presence, or evil. Anyway, since even here in this forum the word evokes such different interpretations, it seems risky at best to ascribe it to God. MarkB is also spot on in his comments, tho’ I’d seriously tweak the first sentence of his post to seem less personal.