We found "Unheard by mortals are the strains" used in 1 sacred songs, each carrying a unique message of faith.
Unheard by mortals are the strains
...Is borne the song that angels know
Unheard by mortals are the strains
That sweetly soothe the Savior’s woe....
Is borne the song that angels know
Unheard by mortals are the strains
That sweetly soothe the Savior’s woe.
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