Into the Storm has a starship component called Broadband Hymn-casters, "flooding all frequencies with deafening hymns to the God-Emperor".
This thread is for "hymn" suggestions.
It doesn't have to be real world hymns, just music that seems "hymny", and appropriate for blasting at the enemy. Latin or pseudo-latin ("high gothic") is always good. Some of my suggestions may be a bit inspirational - you don't want the enemy singing happily along - but I can live with that.
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* Battle Hymn of the Republic (
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* Dies Irae/Day of Wrath (
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Sour Grapes by Puscifer
sounds good, but the lyrics may be too obviously heretical at times. More suitable for a Tzeentch-worshipping ship.