What remain constant in every account of angels, from ancient days to the present, is that they are both messengers and companions to humans, sent from a realm beyond usual seeing. Angels appear, and in one way or another, help us, advise us, inspire us, or amaze us.
Some time ago, I was at a concert and listening to the orchestra beginning to tune up. It was the most discordant sound I've ever heard. Each instrument was playing in its own way, in total disharmony. Then the oboe, a quiet little instrument, began to play and all the other instruments turned in on its note. And gradually, all the disharmony began to calm down. Then there was silence, and the concert began. It seems to me that the mantra is very much like that little oboe. In meditation, the mantra brings all the parts of our being, one by one, bit by bit, into harmony. And when we are in harmony, we are the music of God.