St. Hildegard of Bingen, a mystic saint of many talents and gifts, was also a composer of choral liturgical music that is still performed today. Her Wikipedia entry includes an excellent summary of her extraordinary musical contributions: https://en.wikipedia.org/wiki/Hildegard_of_Bingen

Below is a link to a recording of “Voices of Angels.” It does indeed sound like the way angels sing. St. Hildegard being such a visionary and mystic, would it be hard to believe that she heard the angels singing and based her compositions on what she heard? Now, centuries later, we can contemplate as we listen. Listen here: