In the ancient and Jewish churches, 'songs' were prophesies about the Lord, especially His coming in the world, subjugation of evil spirits, and liberation of the faithful from their assaults. 'Heavenly songs' are voiced affections or affections expressed and modified by sounds. As thoughts are expressed by conversation, so affections are expressed by songs. From the balance and flow of the variations, angels perceive the object of the affection.

(Reference: Conjugial Love 55)

1040. 'And every living soul that is with you' means all things with a person that have been regenerated. This is clear from the meaning of 'a living soul', dealt with above at verse 10. In the Word, as has been stated, soul' means all life - man's internal life as well as external, and also that in living creatures since these mean the things that exist in man. But strictly speaking 'living soul' is that which receives life from the Lord, that is, which has been regenerated, for this alone is living. And because 'soul' means the life, internal as well as external, with man, 'living soul' embraces in meaning all things with a person that have been regenerated. Residing with man there are things of the will and things of the understanding, the former entirely distinct and separate from the latter; and with a living man every single one of those things is living. For the implications are that as is a person's character so is every single thing residing with him. The life itself that is general to the whole is present in every individual part, for the whole has its origins in the individual parts, as its own particulars. If this were not so no general whole could possibly arise, for it is called general because it arises out of particulars.

[2] As is a person's life in general therefore, so is his life in every individual part, indeed in the smallest individual parts of his motives and intentions - that is, of his will - and in the smallest individual parts of his thinking; so that not the least part of an idea can exist in which the same life is not present. Take someone who is arrogant: arrogance is present in every individual endeavour of his will and in every individual idea of his thought. With someone who is avaricious avarice is in a similar way present, as is hatred with one who hates the neighbour. Or take someone who is stupid: stupidity is present in every individual part of his will and also of his thought, as is insanity with one who is insane. Such being the nature of man, his character is recognized in the next life from one single idea of his thought.

[3] Once a person has been regenerated every single thing with him has been regenerated. That is, everything has life, the amount of life depending on the degree to which his own will, which is filthy and dead, could be separated from the new will and understanding which he has received from the Lord. Consequently as the person who is regenerate is the subject here 'a living soul' means all things with him that have been regenerated. These, in general, constitute the things of his understanding and of his will, interior as well as exterior. They have been expressed in verse 10 above as 'birds and beasts, and wild animals of the earth', for it is said, 'I am establishing My covenant with every living soul - with birds, with beasts, and with wild animals of the earth'.