Who is the Muse?

If the third angel is an unexpected blessing on earth, the person who by the very act of your generosity saves you in return, then is the muse the third angel for an artist?

There are those, like Jamie Dunn, the musician in The Third Angel who can't write and is in a desperate search for a muse, who believe a muse is a person who will inspire. There are others, like Frieda, the young woman Jamie is convinced is his muse, for whom experience itself is the muse. The act of...