The Forgotten Books of Eden, by Rutherford H. Platt, Jr., [1926], at sacred-texts.com

XVII.

Of the singings of the angels, which it is impossible to describe.

IN the midst of the heavens I saw armed soldiers, serving the Lord, with tympana and organs, with incessant voice, with sweet voice, with sweet and incessant voice and various singing, which it is impossible to describe, and which astonishes every mind, so wonderful and marvellous is the singing of those angels, and I was delighted listening to it.