To the chief Musician. See App-64. The changes from 2 Samuel 22 were made when David handed the Psalm over for general use in public worship. The position of this Psalm in the Structure (p. 721) shows that it corresponds with, Psalms 29, with its two answering parts, the "Glory" and the "Voice" of Jehovah. The verbs in the first part (1-6) are literary, and in the second part astronomical, thus interlacing and uniting the two parts in one whole.
Title.. Psalm of David. One Psalm: one whole, not two odd scraps strung together by some late "redactor". See App-65.
declare. rehearse (the Piel part, implying repetition. Compare Psalms 71:15.Genesis 24:66. Figure of speech Prosopopoeia. App-6.
GOD. Hebrew El. App-4.
firmament. expanse.
sheweth. is setting forth. Compare first occurrence (Genesis 3:11.Psalms 97:6; Psalms 111:6).