Also an opera.

MACCUS

[Singing to the accompaniment of a harp]

. . . Wild as the white waves
Rushing and roaring, Heaving the wrack
High up the headland; Hoarse as the howling
Winds of the winter, When the lean wolves
Harry the hindmost, Horseman and horse
Toppled and tumbled; So at the town gate,
Stroke upon stroke, Sledging and slaying,
Swashes the sword, Shivers the shield
Of foeman and kinsman: Such was the fight!
But lustless and lank By the bower of the Lady,
Quenchèd forever, Quellèd and cold,
Cynewulf the King!

There... there don't seem to be any recordings of it.

Just discovered that when Edna St. V. M. was a young thing in New York, it was fashionable to write poems using her name as the final line, e.g.

Laurel is green for a season and love is sweet for a day
But love grows bitter with treason and Edna St. Vincent Millay.