Nachman of Breslov

“ And this is: "For Elohim is the King of all the earth; sing praises in a skilful song;" for then, when Hashem will be king over all the earth and the Malkhut of holiness shall be raised up, then "sing praises in a skilful song," i.e. the chazannim and the singers shall be in knowledge and in intelligence through the Malkhut of holiness’s going up, and they shall receive song from its root in holiness, which is like knowledge and brains of the Malkhut of holiness:
Addendum to the above:
And this is: "For Your mercy is great above the heavens" (Ps. 108) . ”

“ This is why the singer is called ChaZzaN, a term for vision (ChaZzoN) , i.e. a term for prophecy, for he takes the song from the place that the prophets nurse.
But when the singer is wicked, then he takes his song from other birds that are in the qlipah (shells, evil forces) . And it is written in the Zohar: "For the birds in the qlipah nurse from the breasts of Malkhut (kingship, see Appendix) . And when midnight comes, such a cry goes out: "As the birds that are caught in the snare, so are the sons of men snared" (Eccl. 9:12) . ”

“ There came a snake and swallowed the frog -- And Rabbeinu Shmuel explains: “Rabbah says this,” i.e. through learning not for its own sake, the snake shall swallow it. And this is why Rabbeinu Shmuel commented, “Rabbah said this,” i.e. because of learning in order to be called "Rabbi." ”